Why is my computer slow after reinstalling XP?

Computer may be slow due to various reasons like virus to low disk space.There is a nice article on slow computer and its solution in the following link. it may help you to resolve your slow computer issue. Have a look, may help

http://itsupportcell.com/viewtopic.php?f=15&t=38

Was is slow before you re-installed XP? If so then download ccleaner and run it often along with a good anti-virus. I also suggest putting another 2GB of RAM in there, only costing £20 and your computer will be quicker than when you first bought.

Have you ever defragged your computer?

Hard drive fragmentation will severely affect the speed and reliability of your computer. Fragmentation is often the cause of system slows, malfunctions such as system hangs, program errors or a complete crash.

So defrag your hard drive, better yet, install an automatic defrag like Diskeeper, you can download free trialware at www.diskeeper.com.

Here Computer Slow Resolve http://www.windows-techsupport.com/

If the install was a clean install, did you install all the hardware drivers?

Without the hardware drivers, the motherboard and other components will not function properly.

very confusing task try searching from google or bing just that may help

Was the install a clean install?

You need to add more Ram

install you video card drivers!