f keeps repeating

Hi,
I have a Compaq Presario desktop that just started this problem. I booted up this morning and went to a website and tried to type but the f key keeps repeating. I figured the keyboard was bad so I went and bought a new one. Same problem. It happens in Word (the f's just keep going you can type other letters but the f's are continuous), in any menu with an f present. I can't get into system tools because when I select it it automatically select file and settings transfer wizard because it starts with f. Can't get to any websites other than my favorites because I can't type any addresses.

Does anyone have any ideas about this?

DoubleL