A process called 4W7e83eV.exe opens at random times. It also causes an iexplore.exe process to run which opens random annoying advertisement webpages in internet explorer. I found the 4We83eV.exe file in my c:\windows\system32 directory and tried deleting it, but it always comes back. I've ran spyware doctor, spybot s&d, and adaware but they didn't find anything. Using XP pro. Anyone have any ideas what to try next?