Start Hijackthis Scan and place a check next to these items If there.
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
O4 - HKLM\..\Run: [infomathfragdupe] C:\Documents and Settings\All Users\Application Data\PopUploadInfoMath\Time Amok.exe
O4 - HKCU\..\Run: [SafeClose] C:\DOCUME~1\Pravin\APPLIC~1\BAITBA~1\does boob.exe
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Hit fix checked and close Hijackthis.
Restart the PC
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Put in place a good hosts file
http://www.mvps.org/winhelp2002/hosts.htm
How To Download and Extract the HOSTS file:
http://www.mvps.org/winhelp2002/hosts2.htm
Repeat that proccess about once or twice a month
To help avoid reinfection see "So how did I get infected in the first place?"
http://castlecops.com/postlite7736-.html
Any problems now ?