|You appear to have Windows 7 but have posted on the Vista forum. The website immediately below is for Win 7 - do not use it if you are using Vista.|
First try the EXE fix from the list here:
If that doesn't help try the LNK fix too from the same website.
Restart the computer after applying each fix.
If you are using Vista then you need to use this website instead:
If it works then scan your computer for viruses, which often cause this. I would also install and run MalwareBytes freebie too because it often finds what AV's miss. Best use this download (green icon top right - latest):
Always pop back and let us know the outcome - thanks