You can have my email address if you will give me your credit card details......lol :) (joke do not post your CC details here. I would not but others WILL milk you)
Seriously though you are about to tackle a job that although not too hard is a bit of a mission. If you like the challenge then keep going... worst that can happen is that you have to pay someone like me to do it when you have become frustrated.
If you delete the existing partition then create and format a new partition then all the data is effectivly gone. If you had a virus its not going to be an issue any more. Same goes for all your files documents, photos, emails....kiss em bye. Technically the data is still there on the phisical disk but don't worry about that...its another whole discussion...but its why the department of defence and other security concious people incinerate their old hard disks...you can recover stuff from old drives but not from a pool of molten metal.
Before you start collect some settings like your email account setup in Outlook, Windows Mail or whatever. You want.... User name
Password....if you don't know it use Snad Boys revelation or somthing like that to get it...
http://www.snadboy.com/RevelationV2.zip
POP & SMTP servers
What printers, scanners, cameras (indeed any hardware) do you have connected to your machine?
Do you have the CD's that came with them to re-install them?
What about your programs. They will all need to be reloaded...have you got the CD's ready to go?
Windows XP is pretty good making internal hardware work it has a pretty broad base set of drivers. However there are many cases where your graphics adaptor, network card or some other vital piece of hardware will not have drivers loaded to make it work by the Windows setup process. When / if this happens you have to download from the manufacturer a driver for Windows XP. As long as you can see whats going on clearly (800x600 and more than 16 colours) and have access to the internet you will probably be able to get on the web after a reload anddownload any drivers you need. I would advise using a program like Berlac Advisor to discover what your graphics adaptor and network cards are.
http://www.belarc.com/free_download.html
Then goto the manufacturers web site and download appropriate drivers. If your network adator and/or graphics adaptor are onboard (part of the matherboard) then you have to look at the motherboard make and model (also listed in Berlac) then go to the motherboard manufacturers website and download the drivers for your motherboard from there. Download and have those ready to go before you reload and you won't end up snookered.
Hope that helps set you thinking on the right track.
If the above makes no sense or just raises more questions than it answers about the reload then....sorry but you are in for a battle. Don't let that stop you though.....its how i started in computers...by breaking one. Even if you don't win this time you will learn things along the way.