Hello,
What browser are you using?
Does the same issue occurs when you install a Different Browser and try brosing websites?
1) Disable all BHO's from IE
http://support.microsoft.com/kb/298931
2) Could you check if the host file was modified?
host file could be found under:
C:\WINDOWS\system32\drivers\etc
Open the host file in notepad.
Check if you see rogue enteries.
If yes, either you can delete the same OR replace the old one with new one from another good machine.
3) You could also, try working on
Using Symantec Support Tool, how do we Collect the Suspicious Files and Submit the same to Symantec Security Response Team.
https://www-secure.symantec.com/connect/articles/using-symantec-support-tool-how-do-we-collect-suspicious-files-and-submit-same-symantec-sec
4) You could also Try Logging in as a Different User and check if you are facing same issue or not?
If not, you could try deleting the Infected User Profile (Ofcourse, Please take a back up of all necessary files before you delete the Profile)