A week ago I ran into an aggravating problem and haven't been able to fix it. My 2 year old Acer laptop (Vista - ugh) started to deprive me of the ability to run any file operations in Windows Explorer. I first noticed it when I went to delete an mp3 file - when I selected it and right-clicked, Explorer told me it had to stop and asked if I wanted it to restart. So I said yes and have said so about 15 times since, discovering in the process that it crashes on every file extension I have tried, that it crashes when I simply click on the File menu after selection, and it crashes when I try any operation available under the Edit menu. On the other hand I can open any file with no problem.
I have tried System Restore and it has been unable to complete restoration on 2 different restore points. I've run a complete system scan (Norton Security Suite) with no joy, and I've tried turning Norton off - also no luck.
I have installed no software for months, and apart from virus definitions and Windows updates can imagine nothing that would have any effect on the computer.