Programs and Safe Mode won't run, Rundll32.exe won't close?

Yesterday my computer was infected with the Exploit-PDF.q.gen!stream Trojan. McAfee detected and deleted it (supposedly). Everything seemed fine after that, but now certain programs simply won’t open (itunes, mozilla, internet explorer, system restore) and when I try to boot in safe mode the system reboots before it can enter the GUI display. I get no error messages telling me why my programs wont open, and others open just fine. The only lead I can find is that rundll32.exe runs constantly and won’t close when I try to end it in the task manager. Does anyone have any idea what I can do to fix it? I thought about simply wiping clean and getting windows 7, but I don’t have a functioning browser and only have my linux netbook otherwise.