Assuming you're using Windows XP.
Click 'Start' then click on 'Control Panel'
If your control panel has 10 categories to click on, then choose 'Performance and Maintenance'
Click on 'System' at the bottom right and choose the 'Hardware' tab.
Click on 'Device Manager' and then click on the expansion button next to 'Display Adaptors' and you'll see your graphics card listed. You can double click on that to get into the Properties menu for the card.
Alternatively, if your Control Panel is in classic view, then click on 'System' and follow the rest of the instructions.