Can i delete everything on my computer exept for the windows hardware?

I have Windows XP home edition. The Computer is a Dell dimension 4500s. I tried doing a system restore but it only went back about a week so it was useless. I got this computer form my friend for free because he thought it didnt work. It has alot of useless programs, spyware, malware, adware, and viruses in general. I do not have the windows XP disk. That is where i am stuck. Please help and if you have any ideas please help.

Can i delete everything on my computer exept for the windows hardware?trojan

Well, first of all to get the spyware off your computer you can used Yahoo! Toolbar. They have an Anti-Spyware on there. And for teh viruses PCTools has a really good Virus Blocker and gets rid of them all. It's only Free for 30 days though. But if I remember right it's not very expensive. After that you could go into your Control Panel under the Start menu and then go to Add or Remove Programs and you can remove everything on your computer that you want. You choose what get's taken off. Hope that helps.

Can i delete everything on my computer exept for the windows hardware?abtuvurys 2005

You can uninstall everything and reinstall everything
buy a software called wipedrive

look in compusa.com