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If you have not yet resolved this problem, you can run a fix that is successful
If you have a Windows Install disk, whether Dell or other Windows, but it works best with the Windows disk that was first used to install Windows.
You boot to the Windows Disk, then go through the screens until you get offered the choice to install Windows XP using R for Repair Mode. Do NOT use Repair Console. Look specifically for the "R for Repair"
This will enable you to repair your Windows files, setups, and Windows XP programs without harming any of your files or setup. This usually works unless you have unusually heavy corruption or other issues.
It is ALWAYS wise to backup your important files before you do this, as some corrupted files could damage your existing data... but that is usually not the case. You are doing the backup as a precaution.
If you cannot fine the "R for Repair" selection, let us know and we will get the exact details.
With A Dimension 2200, your Windows Disk will be Service Pack 1 or 1a. You can contact Dell and ask that they send you a Dell Windows XP installl disk. They will send you a Windows XP Service Pack 3 that will only work on that computer. In your country, you may have to pay a small shipping fee. In the USA it is less than 14 dollars US.
With a Dell Dimension that old, it is possible that the hard drive has begun to fail. If that is the case, do not spend too much time trying to repair it, as that could make it fail more rapidly.
You would then need a new hard drive, then install your current hard drive in an external enclosure or in the drive bay jumpered as slave with the new drive already installed with Windows XP and jumpered as Master. Then you can drag and drop all your files to the new setup... however you will need the individual program install disks to setup the programs initially.