Windows Activation question

Hey guys so i have a laptop with windows xp tablet edition but I just built a desktop so I'm wondering can I just use my laptop's cdkey to install windows on my new desktop? or does Microsoft do hardware checks at activation?

Nope u can't

You also might have a hell of a time getting Tablet Edition installed on a desktop. You're CD key is only good for one installation at a time, so if the laptop is still in use, regardless of OS version you plan to use on the desktop, you'll need a new license.