MS Remote & Keyboard - Random keypresses/shutdown

Afternoon all,

I have this odd problem with my MS Media Centre Keyboard and Remote.
For instance, when browsing the "Guide" in media centre, if I keep pressing
down on the remote, random characters (0, 6 and 7 generally) appear, or the
guide will suddenly jump to another part of the screen.
With the keyboard, similar things happen: When typing in URL's, more
characters appear. E.g ww0w.mi7cro7sof0t.co0m, which can get VERY annoying,
especially when entering passwords.
If I alt-tab away from Media Centre and open explorer to browse files, the
computer will shut down (as if I hit "Sleep") while using the mouse "nipple".

It doesnt happen all the time, a reboot *usually* sorts it.

Can someone help me before I throw them out the window?

Thanks,
Doc