Bluescreen Everytime Update 64bit SP1

Every time I update Vista Ultimate 64bit SP1 using the Windows update after a restart I get a blue screen. I have to go into safe mode (sometimes the updates are finished at this point when going to safe mode) and in safe mode reboot again and after that all is fine. The updates work, Vista runs fine. It happens every single time I do an update that requires a reboot at the end (Defender definitions update doesnt result in a blue screen).

I would like to fix this before I update to SP2. I have downloaded SP2 but not updated to it. I've only let the computer prepare for updating to SP2 but after this I choose not to proceed. Even after this I get the blue screen. All my drivers and Dell software should be up to date. I've attached the bluescreen message I get each time (don't know if it's exactly the same every time) and some error report Windows gave after restarting from the blue screen....