Application has failed to start b/c qtcf,dll was not found

I recently had my computer serviced by the Geek squad for virus removal, I tried to use itunes and connect my ipod and I keep getting this message by: itunesHelper.exe- unable to locate component. "This application has failed to start because QTFC.dll was not found. Re-installing the application may fix this problem." I have tried to install Itunes and quick time player, but the same error pops up and I can't close the tab. Any suggestions?