XP freezes when opening files

Hello,

I have a computer here that is freezing up when I try to open up a file. If I go into the program first and open it up from within its all fine. But when I click the file in explorer it freezes up the computer and I have to end explorer. This computer doesn't have access to the net, which is why I'm at a loss as to what it could be.

There are barely any *.tmp files as I have already gone and deleted most of them. Thank you to anybody who can give me some advice.