Make sure you have a Windows XP Installation CD (or whatever operating system you want to install). My personal favorite installation guide is the one from Lifehacker.com
"Geek to Live: How to format your hard drive and install Windows XP from scratch" -- written by Gina Trapani, lifehacker.com
(http://www.lifehacker.com/software/windows/geek-to-live-how-to-format-your-hard-drive-and-install-windows-xp-from-scratch-157578.php)
Hey, Windows XP users: The blue screen of death got you down? Missing dll errors making you frown? Frequent software crashes leave you yearning for that fresh, new PC you unpacked with glee three years ago? If you've scrubbed for spyware and viruses, defragged, chkdsked and done the requisite rain dance but things are STILL wonky on your computer, it may be time for extreme action.
Today we're going to go over how to format your hard drive and reinstall Windows XP from scratch to get back that shiny new operating system feeling untainted by years of wear, tear and added and removed programs.
Note for the tremulous: I cannot tell a lie; reinstalling an operating system is NOT a trivial task. There are several junctures where lots of things can go wrong that can affect the way your PC functions FOREVER. Further, this isn't a task one can complete in just a few hours. There are lots of ways to fix PC problems before reinstalling Windows, a fresh install should be an absolute last resort. It took me three years - one which involved installing and uninstalling programs almost daily - to get to the point of reinstalling Windows. You have been warned.
Still with me? Good.
What you'll need:
1. A Windows XP machine in dire need of a fresh start
(Without any crucial, un-backedup data on it)
2. A Windows XP installation CD with a valid Product Key
(Preferably the disc that shipped with the computer originally, in which case the Product Key won't be obviously listed)
3. The CDs and serial numbers of all the software you need to install on your fresh "new" machine
4. Hardware driver discs that shipped with the PC and any components you added on
(Optional, but VERY strongly recommended)
5. Another 'net-connected computer of any OS persuasion with a CD burner, thumb drive, or other removable disk
(Optional, but strongly recommended, for looking up stuff and downloading drivers in case of emergency)
6. One full day to get your PC fully functioning again.
Got all that? Good.
Let's get started.
Step 1. Back up your data.
First, make sure absolutely NOTHING you cannot afford to lose is on the drive you're going to install Windows on (let's say the C: drive.) Move all your documents and settings off the machine. Back up your Firefox settings with MozBackup, export your Quicken file, SyncBack profiles, Apache configuration and absolutely anything else that you want restored after you're done. Just make sure it's off the machine that's going under the knife.
Step 2. Audit your current PC setup...[read the rest of the article].