Interesting bunch of reinstall tips for most all flavours of Windows.

http://www.windowsreinstall.com

Very usefull site indeed :)

start by formating the partition that host the O/S windows by using either a startup floppy or startup program stored in cd-rom. and usually it comes in within the same disc(windowxp).For window98and millenium,use seperate startup disc.then reboot and setup program will start working,follow up as instructed by the system.

Easy enough :)