Can you remember the operating system ? e.g. Windows XP Home, Windows XP Pro etc etc. Do you have a sticker on the computer with the operating system details and product key ?
If so I am sure I can get you a Windows setup CD-Rom. If you don't know what you are doing get the computer to a specialist.


If you have these then the system can be rebuilt, but it is essential that you have a clone copy of the hard drive before you start. There a a number of essential files you need to secure.

Cheers, Rob