Tip of the day:
No one, and I mean NO ONE should EVER take their computer to Best Buy for any kind of repairs or installations. I mean, never mind the fact that they do "cheap virus scans!" and all that super-cool stuff - but the Dumbshit-Squad is usually as clueless as a blade of grass.
They can make something as simple as a dual-boot insanely complicated, and I would never recommend BB to anyone.