We are going to attempt what is called a Parallel Installation.
This will keep your current data intact but hopefully allow you to boot into windows with a fresh copy of windows installed.
Please do the following steps in order so that we can make sure the steps work correctly.
To change Boot Sequence in your BIOS
Reboot the system and at the first post screen (where it is counting up memory) start tapping the DEL button
This will enter you into the Bios\Cmos area.
Find the Advanced area and click Enter
Look for Boot Sequence or Boot Options and highlight that click Enter
Now highlight the first drive and follow the directions on the bottom of the screen on how to modify it and change it to CDrom.
Change the second drive to the C or Main Drive
Once that is done then click F10 to Save and Exit
You will prompted to enter Y to verify Save and Exit. Click Y and the system will now reboot with the new settings.
Hopefully you have already put the XP cd in the drive before all this. If everything is setup correctly you will get a black screen with the following message in the upper left corner:
Boot to the Windows XP installation cd by pressing a key when the "Press any key to boot from cd" prompt appears at the top of the screen.
- At the "Welcome to Setup" screen, press Enter to set up Windows XP.
- Accept the License Agreement by pressing F8
- With your current installation selected in the box, press Esc
- Select C: Partition1 [NTFS] in the box and press Enter
- To continue setup using this partition, press C
- Now you should see formatting options...choose the last one, Leave the current file system intact (no changes), and press Enter
- To use a different folder, press Esc
- Name the folder WINDOWS0 (just type a 0 (zero)) and press Enter
The data will be located in the Documents and Settings folder (C:\Documents and Settings) under your old user account name...so when you set up the new installation, give yourself a slightly different user account name.