I have a similar model toshiba laptop and I have had the same issues for months, with EVERY build it windows 7, usually putting in a vista disc and formatting the HD would fix it, but with the final RTM that doesn't even work.
I can put the dvd in and it will load drivers and get to the point were it has the windows 7 logo with the flying colored logo, then it stops and blue screens, I can't even get a chance to partition the hard drive or anything.
I updated my bios today thinking that would help but it didn't. Looks like im stuck with vista or have to get a 32 bit OS.
This is just stupid microsoft hasn't realized this problem and let an OS go out the door in this condition.