Solved: some forlders cannot be removed, what to tdo?

Hello guys

2 days ago I noticed all word files became with name.doc and PDF files name.pdf,
if I delete the .doc or .pdf the file changes its form and cannot be opened,
also I noticed some new folders in my drive D createsd and cannot be deleted, even empty! and the color of the folder is a little looks like has shadow or not clear as the usual folder yellowish color,

I suspected it's a virus or trojan or not sure about, even I am using norton version (full options) and scanned them many times but nothing happen..!

any help will be really highly appreciate, with lot of thanks in advance,
regards

 

Hi phantom010, was done to hide the file extensions, I do appreciate it for u with lot of thanks..

still some folders in my drive D cannot be deleted, even they are emply .. always deny to delete, their color is faded not as the other folders, I did not creat them.. what can do to delete them?
I will really appreciate if any possible solution,
Regards

 

Thanks again phantom010, your efforts highly appreciated,

the folders named as follow:

1. RECYCLER
(inside this foloder there is a recycle bin named "5-1-5-21-776561741-2000478...") and when I click on it aoorear this message:"contains the files and folders that you have deleted."

2. System Volume Information

the above 2 folders have been created just 2 or 3 days ago when file entension started to appear, I borrow one of my friends a USB and when he returned to me I saw a warning by the Anti virus, I scanned and cleaned it before open, then started this, he informed me that his laptop infected, but I though when scan before open will be ok,
I hope I gave clear idea about this issue,

Regards

 

phantom010 , it was done.. !! you are great helper indeed, lot of thanks and wishing a a merry Xmas and happy new year 2011 for you all Tech guys indeed you are always very helpful to me..

Once again many thanks for the kind efforts phantom010 and have a great day