Free advice for Windows 2000 users.
If you do not have a good backup plan, run not walk to your favorite vendor and get another Hard Drive. An 120 GB would be ideal for Windows 2000.
Just re-install Windows 2000 of the new drive. Get updates, or do Sp-4. Get a decent anti-virus. Install the programs you trust and need. Your performance will be better. Take my word for it!