Please, Don't Delete Those Files!
If you don't know what they are, leave them alone!
Why do some computer users want to delete every file they don't understand? There seems to be a compulsion to keep a computer free of 'junk' files and folders.
Microsoft made some files and folders 'Hidden' in every version of Windows. There is a very good reason for 'hiding' those files and folders. It's to keep users from deleting them or trying to edit them.
But a lot of troubleshooting requires users to enable viewing those file and folders and many websites (including this one) tell folks how to view those 'Hidden' files and folders. It is a good practice to 'hide' them again once the troubleshooting is completed, but most folks leave them enabled to view.
Some users know how to enable the viewing of those folders Microsoft 'hid' and so when they get a new computer or upgrade their older computers to a new version of Windows, they enable the view. That's OK, as long as they don't decide to start 'deleting stuff' that shouldn't be deleted. Windows has a built in protection that won't allow most of the required files and folders to be deleted, but that doesn't stop some users from trying. Then they are frustrated because the files can't be deleted and seek out ways to accomplish their desire.
There are times when files can't be deleted that should be deleted. This is a frustrating experience, especially if the file is on the user's Desktop. So users search, post questions to lists like Yahoo Groups and find ways to remove the offending file. Now the user wants to know how to delete all those 'junk' files that Vista creates. Hmm, I have a feeling that user better leave those files alone if he/she wants Vista to work right and installed programs to work! Vista has a new way to put files on computers and what may appear as 'junk' can be something Vista needs or more than likely something a program needs.
I rather suspect this compulsion to delete 'junk' is due to the fact that Windows should remove temporary stuff when it is no longer needed, but I have yet to see a version of Windows that actually does remove junk from the Temp directories. Internet Explorer does not remove all those Temporary Internet files unless the user manually removes them. So users are used to clearing out 'junk', but they need to learn not everything they don't know what it is may not be junk.