1- right click on my computer and tell us how much ram is in your PC
2- Is it a PC or a laptop?
3- Have you defragged your hard drive lately?
4- You can buy win XP in many retail stores and also online, you can try e-bay or any stereo store
If you need help with any of that, here is an easy how-to
You may also want to run some virus scans using the following free tools
1- trojan remover
2- hitman pro
Run those till they are clean
Some HELP in posting on Computing.net plus free progs and instructions Cheers