Sounds like the ATI keys problem. Do you know if the machine has an ATI graphics card fitted? (Right click on the desktop, properties, settings and have a look at the "display" text).
If so you have to stop the ATI Keyboard poller service from running and make sure you don't have "sticky keys" switched on from the control panel.
The way to do this is to START -> RUN -> MSCONFIG and disable the atiptaxx and atihotkey poller under startup and services tabs.
The sticky keys are in control panel -> Accessability options
You will need to reboot for the changes to take effect.
And