Windows 7 Problem upgrading

[Glanis]

Hey so I've had a bit of a problem upgrading from 64bit vista to 64bit win 7, from the start the whole upgrade seemed sluggish, I downloaded the updates for the installation, and went through the whole thing, half way through comp went into safe mode and started to switch screens(I have 2 and swapped between the 2 not all the time but roughly every 5mins), neway I left it for awhile maybe 30mins to come back to a blank screen, I left it for an hour and a half and to no suprise was still blank, I figured I would restart it(bad idea), anyway now it goes to load win7 then comes up with some crap about finishing installation after it restarts, and yeh it just goes in a loop, am I screwed and just have to start fresh and lose everything