I right clicked on an .exe folder and was looking for a program to open it with but i accidentally opened it with "installshell" and nothing happened.
and now, when i click any program (even internet explorer) installshell tries to open it. when i right click on the programs the "open with" menu is gone, it vanished. I cant install anything, i cant open anything, im screwed.
when i try to do a system restore i click on the restore button and nothing happens! nothing! will someone please help! anything would be appreciated just dont tell me to install anything because i cant. installshell is trying to open every folder i click on.

P.S. im using vista.