We have three computers in our house and the all run Windows XP.  The one our son uses has been running very poorly.  Ireally think he downloads way too much stuff and when he uninstalls programs all the files aren’t deleted.  Both my wife and I have been having problems as well.  I started looking at the available Windows XP Registry Cleaners so I could run a scan on all the computers and get them back up to speed.  I was able to find a program that allowed me to install the program on multiple computers.  We are all running at top speed now and she stay that way since I have set up an automatic scan.