I have communicated my problem with yahoo. I think they prompt responsively, even though still not solve my problem yet

I have tried to follow their recommendations but unfruitful so far. Weird.
I believe a malware or hijack persists on my PC. I removed it several weeks ago but very painful, since I have to totally restore my PC to the very original condition when I purchased it. I want to avoid this last resort, hopefully someone can help me.
Below is last response from yahoo customer service.
Hello Firman,
Thank you for writing to Yahoo! Mail.
If you get a cookie error, or you're being sent back to the Sign In
screen with no error message, your user cookie is probably not being set
properly.
A 'cookie' is a small piece of information stored by your browser to
help identify who you are. Yahoo! Mail uses cookies to keep you signed
in to your account as you move from page to page. If your cookie isn't
being accepted properly, you'll be signed out of your account when you
move to a different page. This is probably why you're having trouble
signing in and remaining signed in.
There are a number of reasons why your cookie may not be set properly.
I've listed them from easiest to hardest in order to save you
unnecessary steps:
* The date on your computer might be set incorrectly. Since cookies rely
on dates, a computer with an incorrect date may confuse your browser
into forgetting about your cookie. To fix this, simply set the correct
time and date on your computer.
* You might have installed an application that monitors/blocks cookies
from being sent, such as virus protection software. If so, disable it
before you sign in.
* You might be behind a firewall that doesn't allow you to receive
cookies. This is sometimes the case for users connecting from a business
intranet with high security. To see if this is why you're having
problems, contact your Systems Administrator.
* Your browser may not be set to accept cookies. Most browsers have the
option of either accepting all cookies, showing an alert before
accepting a cookie, or not accepting cookies at all. In order to use
Yahoo! Mail, your browser must be set to accept all cookies without
alerts. If your browser gives you the option to accept all cookies, you
should choose it. If your browser gives you the option to show an alert
before accepting a cookie, you should not select it. Below are the
setting instructions for several popular browser types.
When making these adjustments, be sure to confirm any changes you make
by clicking 'OK.'
Enable cookies - Internet Explorer 7.x
1. Click Start and select Control Panel .
(Windows XP Classic View - click on Windows Start button and
select Settings and Control Panel ).
2. Double-click the Internet Options icon.
3. Select the Privacy tab.
4. Under Settings , click Advanced button.
5. Check the box Override automatic cookie handling under Cookies
section in Advanced Privacy Settings window.
6. Under First-party Cookies , select Accept .
7. Under Third-party Cookies , select Accept .
8. Check the box Always allow session cookies .
9. Click OK .
10. Click OK to exit.
If your browser isn't one of the ones listed above and you need more
information on cookies, please refer to your browser's help file.
Your browser's cookie files might be corrupted. Corrupted cookie files
sometimes stop supporting Yahoo! Mail. Try shutting all of your
browser's windows, and then deleting the cookie files in your browser's
directories.
You should delete the cookie files themselves, but you do not need to
delete the folders where they are stored.
If you're using another operating system:
Some web browsers have their own existing steps for deleting cookies.
For instance, with Internet Explorer versions 4 and higher on Macintosh,
you can delete the cookies files via the 'Cookies' panel in Internet
Preferences. For browsers that don't have that ability, these general
instructions may help:
Find the cookie files. To find these files:
1. Use your operating system's 'Find' or 'Search' feature to search for
the word 'cookies.'
2. This should bring up a list of the folders and files with the word
'cookies' in their file names.
3. Identify the Internet cookie files. It is important to differentiate
Internet cookie files from other files with the word 'cookies' in their
file names. Internet cookie files are usually located within your
browser's directory on your hard drive.
4. Delete the Internet cookie files. Do NOT delete any file that you
believe you may have created yourself or that you suspect might not be
an Internet cookie file.
If none of the above suggestions have solved your problem, your browser
itself might be corrupted. The easiest solution may be to try another
browser (if you have one) on your computer. You may want to reinstall
your current browser as well by finding the original installation file
and repeating the install process. As a last resort, you can download a
new browser, or an updated version of your present browser, from the
Internet. This may take awhile, depending on your modem's speed.
The Firefox browser can be found at:
http://www.mozilla.com/en-US/firefox/
The Internet Explorer browser can be found at:
http://www.microsoft.com/ie/download/
I hope this solves your problem, and I'm sorry for the inconvenience.
Thank you again for contacting Yahoo! Mail.
Regards,
Nelson
Yahoo! Customer Care
Get easy access to all of your favorites.
Make Yahoo! your home page:
http://us.rd.yahoo.com/evt=38861/*ht....com/homepage/
For assistance with all Yahoo! services please visit:
http://help.yahoo.com/
Original Message Follows:
-------------------------
OS: Windows XP Home Edition.
browser's agent string:
IE7.0: Mozilla/4.0 (compatible; MSIE70, Windows NT 5.1;
MSDigitalLocker; .NET CLR 1.1.4322)
Firefox: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; .rv:1.8.1.6)
Gecko/20070725 Firefox/2.0.0.6
This problem happened when I log on to my yahoo account and ebay
account as well, both in firefox and IE since a month ago or so. It
was probably initiated during downloading updates and setting up my
laptop after I fully restored it to original OEM condition for some
reasons. Since then, I never been able to open my yahoo and ebay
account on my laptop.
Please find attached my laptop specification, screenshots you
requested and hijackthis log for review. I am awaiting for your
solution.
Thanks in advance.
best regards,
Firman
On 8/9/07, Yahoo! Mail <mail-candygram-errors@cc.yahoo-inc.com> wrote:
> Hello Firman,
>
> Thank you for writing to Yahoo! Mail.
>
> Firman, we understand you have issues with IE7 that are affecting your
> Yahoo! Mail account. We're glad to be of assistance. To help us get
a
> better understanding of the issue, please reply with the following
> details:
>
> * Operating System you are using (ie: Windows or MAC and what
version)
>
> * Your browser's user agent string. You can get this by typing this
in
> the browser's(such as IE, Firefox, or Safari) Address box:
> javascript
:alert(navigator.userAgent)
>
> * Are you able to replicate this issue in other browsers?
>
> * Do you have any other relevant information that may help us resolve
> this issue such as how often this occurs and what page you are seeing
> this on?
>
> * Please forward a screenshot of the issue you are experiencing if
> possible.
>
> To take a screenshot, simply do the following:
>
> 1. Press and hold down the "Alt" key on your keyboard. While holding
> down the "Alt" key, press the "Print Screen" key located just above
the
> "Insert" key.
>
> 2. Click the Windows "Start" menu and select "Programs" then
> "Accessories" then "Paint".
>
> 3. Once the Microsoft Paint application is open, click the "Edit" menu
> then select "Paste". If you're prompted that the "image in the
clipboard
> is larger than the bitmap", click the "Yes" button.
>
> 4. Click the "File" menu in the upper left-hand corner of the Paint
> application then select "Save As".
>
> 5. Enter a name for the "File name" field.
>
> 6. Choose "JPEG" as the "Save as type" option.
>
> 7. Save the file to an easy remember location like your desktop then
> close the Paint application.
>
> 8. Attach the file to your email response and include any other
relevant
> information. Once we've received your reply, this will help us
> investigate the issue in further detail.
>
> Once we get your response, we'll be happy to look into the issue. We
> look forward to hearing from you soon.
>
> Thank you again for contacting Yahoo! Mail.
>
> Regards,
>
> Steven
>
> Yahoo! Customer Care
>
> Get easy access to all of your favorites.
> Make Yahoo! your home page:
>
>
http://us.rd.yahoo.com/evt=38861/*ht....com/homepage/
>
> For assistance with all Yahoo! services please visit:
>
>
http://help.yahoo.com/
>
>
>
>
> Original Message Follows:
> -------------------------
>
> Mail-Id: 1186600208-7205
> "Name:" : Firman Hanif
> "Yahoo! ID:" : abulfayyadh
> "Email Address:" :
firmanh@gmail.com
> "Operating System:" : windows XP
> "Type of Browser:" : internet explorer, firefox
> "Browser Version" : IE7, firefox4
> "Issue Type:" : Temporary Access Error
> "How often this occurs:" : Always
> "Description" : Hello,
> I'm unable to log on at my PC. After sign in (put user ID and
> password), the sign up page always reload, as if I did not key in
> correct password or user ID. I am always redirected to this page:
>
http://e.my.yahoo.com/config/my_init...ner=my&.from=i
> I wrote this email from my college. This problem just happened at
yahoo
> and ebay as well, not at gmail. At ebay, I'm unable to open my
> account there.
> Thanks for your help.
> firman
>
> "Information Passed In":
> ------------------------
> "from_url" :
>
http://help.yahoo.com/l/us/yahoo/mai...tus/index.html
> ------------------------
>
> While Viewing:
>
http://help.yahoo.com/l/us/yahoo/mai...tus/index.html
>
> Form Name:
http://help.yahoo.com/l/us/yahoo/mai...ail/bug_f.html
>
> Yahoo ID: abulfayyadh : Yahoo id from cookie
>
"https://amt.yahoo.com/amt/dosearch?.token=lI9AYoGEhcTEMy_3zGkMoDLkxuMK0
> 4tsB_qzmC9_1y4Z"
>
>
> Other ID:
>
> Browser: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Imperial
> College; InfoPath.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
>
> REMOTE_ADDR: 155.198.97.211
>
> REMOTE_HOST: ese-petsci27.ese.ic.ac.uk
>
> Date Originated: Wednesday August 8, 2007 - 20:10:08