I also found another file giving me problems: p2pnetworking.exe in \windows\system32. My anti-virus program found it but couldn't delete it. Following the advice in here I managed to delete it myself.

I wanted to pass along that I too couldn't get to \windows\system32. I ended up going in Windows Explorer and going to the Windows subdirectory. From there I simply typed \system32 in the address line and clicked go. I made it there and could do all the rest to get rid of the "winupdates" virus.

Best of luck!