Removing Orkut\Mozilla Virus

Run the task manager,in processes tab you'll see two processes svchost.exe running under your user name, end them.
then go to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\policies\Explorer\Run
delete winlogon key



then go to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
here set the checked value to 1

AND IF you are not administrator, the virus couldnt access the registry, so you'll see an invisible icon in the startup menu of start menu, delete it

DO ALL THIS AFTER YOU END THE TWO PROCESSES otherwise they'll be RESTORED every 10 seconds

After all this go to folder options uncheck hide protected files
you'll see C:\heap41a folder, delete it and you'll see microsoftpowerpoint.exe in your pen drives along with autorun.inf , delete them