btkrnl.sys

hi,

I have just tried upgrade from xp home to vista home preimum, my system
specs meet the requirements of vista and i uninstalled all software which it
recognised as being incompatable..

The installation seemed to go fine untill it got to the end of completing
upgrade, from here i goes into a loop of restarting the computer, a blue
screen appears for a second until it reboots.

Running a safe mode session results in it stalling at btkrn.sys.

any ideas of how to fix this are welcome

thanks for reading