Hi Ambassador,
It's cool to do a Disk Cleanup and Defrag every once in awhile but it's never really noticably speeded up anything for me. And sometimes if your OS isn't up to par it can really screw things up.
If you uninstalled everything properly and then you reinstalled CFS3 and it still doesn't work right I would start to consider a format and clean install of XP. Is your computer showing any signs of slowing up or are any of your other games running slower?
But before doing that I would suggest that you download, install and run Ad-aware 6.0 (and update it) first and see how much Internet gunk (spyware) that you have installed on your computer.
http://www.lavasoftusa.com/support/download/Some of that stuff can really screw up a computer especially if you have whole bunch of it installed. In just one hour of simple surfing I had 28 cookies and one instance of Alexa/Gator already written to my registry. These spyware companies are shameless. I've heard of people having hundreds of unnecessary cookies and spyware programs installed on their computer and being unaware of them.
Then you should run your updated antivirus program. If you don't have one or your subscription has run out you can get Grisoft's AVG 6.0 for free. It's what I use. Make sure you run the "Update" feature on it after you get it installed.
http://www.grisoft.com/us/us_dwnl_free.phpIf you have broadband every once in awhile go to
http://housecall.trendmicro.com/ and run their free online AV scanner. Even if you have dial up you can run it but it might take a half an hour or more.
And last but not least do a registry clean every once in awhile. I use the free RegCleaner 3.8 which you can get at:
http://www.webmasterfree.com/regcleaner.htmlJust be careful that you don't delete anything important in your registry. If you run the "Automatic" feature of RegCleaner you shouldn't have any problems.
Good luck and let us know how you make out.