You could start by telling us the specific O/S you're running, the make/model of the keyboard, etc. I'd guess you installed a keyboard driver that isn't compatible with the existing keyboard. Perhaps there's an entry in Add/Delete programs that will remove the errant keyboard driver. You could also edit WIN.INI and comment out the keyboard driver line.
I would dump Norton...(easier said than done) and go with AVG (it's free and takes up less resources). You might try deleting Norton and see if it clears up the problem in case it was a bad install...
or go into Device Manager and see if you have a X or ! next to your keyboard. You should be able to delete the driver and reboot, letting Found New Hardware Wizard reinstall it or install the driver that came with the hardware (you will need your 98se CD)
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