Buncle

Hey Guys, While intending to install XP Tablet, in inadvertantly installed MCE instead (it was late... I was tired...). My question is, is it possible to add the Tablet features to my MCE installation, or even is it possible to upgrade/change my current installation to a Tablet edition? Otherwise, am I going to have to reinstall (which is a bit of a bugger as I have no external drives for my tablet, so reinstalling involves a major operation with a screwdriver and a IDE/USB adapter). Cheers, Buncle