Conan,
Media Center (SP! Why couldn't they simply change the letters for the UK version?) is merely XP Pro with an extra bit of software. I think the reason they sell it as a new type of XP is to make sure people have compatible TV cards etc. Stops Jonny Nobrains trying an upgrade and not understanding why he can't record Eastenders!
DRM should not be an issue, it'll cripple Vista, but thats a different thread altogether!
Have you tried disabling it in control panel/system/hardware/. Then removing the driver. Reboot with it enabled and get a windows auto-install?
Personally I never believe anything a call centre has to say. I just go through the motions to add ammo to my complaint. Not had expericence with Dells' CC mind you.
CBA