If you accidentally delete a folder or file and then empty the recycle bin you can restore by creating another folder or file with the same name; right click on properties go to previous versions tab and select one of the restores.
Avoid Win XP Re-activation – WorldStart Computer Tips and Computer Help
The time may come that you’ll need to reinstall your Windows XP. It could happen. Maybe you’ll add a new motherboard or hard drive. Maybe you’ll get constant errors and problems that just won’t go away. Or perhaps you’re a neat freak who wants to rid yourself of clutter and start fresh with a clean operating system. If you do reinstall Windows XP, then you’ll need to re-activate it too—that is, unless you keep this tip handy
Troubleshooting Windows XP, Tweaks and Fixes for Windows XP Lots of tips for XP here
Windows XP Home and Professional Service Pack 3 Service Configurations by Black Viper
Useful guidelines on what WinXP services can be disabled so as to free up more memory.
50 Windows Tips & Tricks – Computeractive
Here’s some useful tips & tricks
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Importing folders – MozillaZine Knowledge Base
This article gives step by step instructions for how to import folders from another profile for a new user who has never installed an extension. It assumes you’re using Windows but you should still be able to follow the instructions using a file manager on another operating system.
10 things you can do when Windows XP wont boot
If your computer powers up okay, but the Windows XP operating system won’t boot properly, you have some troubleshooting ahead of you. Here’s a look at the likely culprits and what you can do to fix the problem.
Well worth printing out.
TweakGuides.com – Firefox Tweak Guide
12 pages of useful tips on how to tweak Firefox.