SOMETIMES programs do that!
BUT, you should have had a msg about it when you deleted it.
Assuming you are on 98.
Go to control panel - Add/Remove programs and remove the keyboard driver you installed.
Then click System - choose the Device manager tab.
Scroll down 'til you see keyboard and click the + sign next to it.
Highlight the keyboard and click properties (at the bottom of the window) Click the driver tab and click update driver. tell it you have the disk when asked, and follow the prompts.