Reinstalling windows? read this first

If your Windows installation is gone all bad because of thousands of application install/uninstalls, non working file associations,regular crashes at inconvenient times and most likely viruses, all you think of doing is reformatting your operating system and start working again.
But it takes at least 45 minutes to reinstall windows xp sp2 (in case of vista it takes hours) and that's a lot of time.
But is there any way around?
Yes there is one full proof way of making your windows work "like new installation" in less than 5 minutes.You dont need reinstall windows xp.
Here are the steps to follow.

• Back up all your files
• Log on as a different user on the machine
• goto Properties-> Advanced Settings(check above image)
• Delete your user profile
• Log on as your old user account
• All your files will be gone (i told you to back up, didn't i?)
  

Now you will have a clean registry, and as far as all applications are concerned, you are a new user.
Now you can continue the same application install/uninstall series until you get bogged down again.