Bit different one.. but if you want to try then you can..
Go to your Installed IE folder.
..\Program Files\Internet Explorer
You will find iexplore.exe
What virus is looking for iexplore.exe and firefox.exe Kill them.
Dont allow the user to open.
Change the file name to any thing like My_Explore.exe.
Make shortcut of it on your desktop.
Simllarly do the same thing for firefox.
Open IE and Firefox now from this new shortcut.
Bit tidious one.. This solution is the best working solution till date. I know the code of virus but dont know where exactly it attacked. But I know what it is really doing to the process.