i know how you feel. i've been using a lap top for about 6 years. the first was that old it was on XP! i up-graded to a used vista 3 years ago without any real problems. i use the lap top and a mini disc player in my stage act, alternating between each so i dont get any embarrassing gaps.
the lady i bought it from has trashed 4 new lap tops in the mean time, so i thought i was doing well. till tonight!
last night i had a 6 hour gig, half hour on half hour off, the lap top was running all that time so when i went to start up tonight it gave me the blue screen! i tried everything i could think of. eventually i got it into "safe mode" then did a "restore" and took it back a month. thank god it's now working (i hope) and some stuff i lost a week ago is back. so fingers crossed. the other option was to delete the whole hard drive which would mean losing all my backing tracks. then re-recording the lot. i think i'd retire first.
hope you can get it back up and running soon.
There are two "L's" in Phill