Windows 7 - Disk Cleanup and Temporary Files

I had a question about the Disk Cleanup in Windows 7 Home Premium:

The disk cleanup box says, "You can safely delete temporary files that have not been modified in over a week."

When I run disk cleanup, does it only delete files older than one week or all of them? I want to make sure that disk cleanup won't delete something that it should not delete.

Just upgraded from Vista to 7 and love Windows 7 already!

You will be ok it is very selective. If it deletes cookies from websites etc and you have to sign in again. Come back I will tell you how to avoid it in the future, but go now and use it.

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The only time I have ever experienced a problem with clearing temp files was during an application install that required a reboot - files that were needed to finish the process were deleted and the install failed (so I just ran it again). That was years ago though and has never been a problem with Vista or 7 in my experience. I occasionally use Ccleaner which is much more aggressive then Disk Cleanup and I have not had problems with it either. Just be aware if you delete all the cookies you will need to re-enter previously saved passwords for websites.

IF you are going to clean temp files yourself use CCleaner, I wouldn't use the one that comes with Windows: CCleaner - Home

Cannot comment on CC cleaner, but since windows 98, I never had a problem using the built in windows cleaner.

+1 i've been using CCleaner for ages now and i love it. make sure you go into settings and make check the top 3 options. it will clean your temp files when you boot up and you can do so easily just by right clicking on your Trash Bin.