Instant windows xp registry fix involve using a fast and efficient registry cleaner.  Easily fix corrupted files, get ride of errors caused by faulty programs, and ensure the optimal speed of your PC.  If you notice that your computer has been slowing down more than usual or has decreased speed drastically, then this is most probably caused by errors on your computer registry.  For Windows XP users, Windows XP registry fixes are available for download over the internet.  Microsoft has successfully come up with a registry cleaner called RegCLEAN which is a compatible Windows XP registry fix.  RegCLEAN quickly scans your computer registry for errors and repairs your computer immediately.