Vista 64 crashes when installing its 2nd patch update

I try to keep my computer updated as possible, so I have installed windows vista service pack 2. I have vista 64 in a HP pavilion tx2000. Once the update is installed the computer starts to crash (blue screen), so I have recover the system using the point recovery. I have done this several times in order to be sure that it is the windows update that crashes. It looks that theres is something wrong with this second patch, have you any idea or have you gone throug something similar?