Vista - update made my laptop cease to work

hi, i just installed the update for windows vista the other night titled windows vista service pack 1. i let the update install during a shutdown and decided just to let it go overnight. when i tried to turn on my laptop the next morning, it booted up like normal then went to a black screen and looked like it was loading a series of files out of /82467. its done this before and i thought nothing of it.

it eventually stopped loading and displayed this message.

! ! 0xc0190036 ! ! 5095/82467 (mscormmc.dll)

nothing i do seems to work..cant boot it in safe mode or any other mode for that matter. i tried to system restore it to before the update was installed but it keeps coming up unsuccessful. all of my important work is on this laptop and i would really appreciate it if someone could help me out with this problem. thanks.