This is a driver for Windows 2000. There is no driver specially made for the Compaq IJ300 that's compatible with Windows 2000. This driver is for the Lexmark Z11, but works with the Compaq IJ300.
Download this if you have Windows 2000 and a Lexmark Z11 or Compaq IJ300. Download it, extract it, and go to the "Printer" part of your computer under "Settings" on the start menu. Click "Add Printer" and when it asks what type of printer it is, click on "Have disk" and click on the driver you extracted and hit "OK".