i was told that there are registry tweaks that can enhance the performance of xp. i am really wondering if i should even do it, i mean my comp is lightning already : ).
Something pretty neutral that you can do is find a registry cleaner that you like and run it periodically to clean up after uninstalls and the like. I use CCleaner- light weight and free (http://ccleaner.com) but there are others out there.
The one thing to remember about this particular tool is that you have to run it recursively in order to get all the bits. Identifying and eliminating a fragment is likely to reveal a new fragment. I just run it until it doesn't find anything new. And as with anything to do with the registry, make sure that you make a back up first. CCleaner will prompt you to do this.
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registry tweaks