Please do the following:
Reset all the browsers back to default:
Instructions on how to backup your Favourites/Bookmarks and other data can be found below.
Backup Internet Explorer Bookmarks
http://www.wikihow.com/Back-Up-Favorites-in-Internet-Explorer
Backup Firefox Bookmarks
https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
Backup Chrome Bookmarks
http://www.wikihow.com/Export-Bookmarks-from-Chrome
Proceed with the reset once done.
I.E.
Open Internet Explorer, click on the gear icon at the top (far right), then click again on Internet Options.
In the Internet Options dialog box, click on the Advanced tab, then click on the Reset button.
Reset Internet Explorer
In the Reset Internet Explorer settings section, check the Delete personal settings box, then click on Reset Internet Explorer back to its default settings
When Internet Explorer finishes resetting, click Close in the confirmation dialogue box and then click OK.
Close Internet Explorer.
Firefox
At the top of the Firefox window, click the Firefox button, go over to the Help sub-menu and select Troubleshooting Information.
Click the Reset Firefox button in the upper-right corner of the Troubleshooting Information page.
To continue, click Reset Firefox in the confirmation window that opens.
Firefox will close and be reset. When it’s done, a window will list the information that was imported. Click Finish
Google Chrome
enter the following into the Chrome address bar:
chrome://settings/personal
• and at the bottom click on "Advanced Settings"
• At the very bottom of the page click on "Reset Browser Settings"
Then if you use the sync feature, check the section for "delete your synced data from your Google Account " at the bottom of this page
http://support.google.com/chrome/bin/answer.py?hl=en&answer=185277
NEXT
Reset your Router:
This can be done by inserting something tiny like a paper clip end or pencil tip into a small hole labeled "reset" located on the back of the router.
Press and hold down the small button inside until the lights on the front of the router blink off and then on again (usually about 10 seconds).
If you don’t know the router's default password, you can look it up. HERE
http://www.routerpasswords.com/
You also need to reconfigure any security settings you had in place prior to the reset.
You may also need to consult with your Internet service provider to find out which DNS servers your network should be using.
NEXT
Please do the following:
type cmd.exe into the search box
RIGHT-click on Cmd.exe when it populates in the window below
Select
Run As Administrator
In the command window type the following and then hit enter:
ipconfig /flushdns
You will see the following confirmation:
"Windows IP Configuration
Successfully flushed the DNS Resolver Cache."
Let me know how that worked