The Surface forum would have been fine too, but this works.
You can try booting to the built-in recovery mode. However, it's possible that the recovery partition was removed to free up space. No worries, though! All you need is a bootable flashdrive with a recovery image. The files needed are available on this site (check the Surface sub-forum). After you've created the recovery flashdrive, turn the tablet fully off, insert the drive, hold the Volume Down button (well, rocker), and turn the tablet on again. It should boot directly to recovery. The recovery process should reformat the internal storage, which will remove the BitLocker'd volume.
Win8/Windows RT projects:
List of desktop apps for hacked RT devices
Native Access WebServer and Libraries
WP8 Interop Unlocks
Storage Cleanup tool
XapHandler, Root Webserver, OEM Marketplace XAPs, Bookmarklets collection (Find On Page), Interop-unlock hacks.
Do not private message me with questions that should have been posted on the forum!
Not only are you wasting your time - I'm not going to bother writing an answer to such a question for only one person - but I will probably block you from PMing me in the future as well.