[Solved] Windows Vista Registry error?

something is wrong with the registry in vista... When I right click on computer on the start menu and select properties it gives me a error that says "This file does not have a program associated with it for performing this action. Create an association in the Set Associations control panel" I have checked in the program defaults page and found nothing that has anything to do with that particular file. Also I cannot open system up in control panel, I right click on it and all it says is crate short cut (no open). Furthermore my thumbnails are not showing up in any of my folders (yes I have checked and double checked the folder options in ctrl panel).
Please help and thank you.

Try to download CCleaner to fix this problem.

http://www.piriform.com/ccleaner

Best answer selected by mousemonkey.