Okay let me think....do you have a video card in the computer? If you lack a video card it's probably the reason for the slowdown.
In any case....
How to change the hardware acceleration settings in Windows 98 / XP:
1. Right click on the desktop and select Properties from the pop-up window.
2. Click on the Settings Tab.
3. Click on the Advanced button.
4. Select the Troubleshoot tab in Windows XP(Performance tab in Win 98)
5. Move the slider on the center of the window to the half way point and click the OK button.
NOTE: Depending on what video card your workstation has, the windows might not look
like the windows pictured in the document, however the tab names will be the same.