sys 32 drivers blue screen

After doing an update I got the old BSOD and have gotten several different codes sense than but it seems I need to replace my sys32 drivers .Unfortunatly my computer will not boot from the disk , safe mode or any other way but just returns me to a variety of stop messages. I feel like I am missing something at this point and need a suggestion of where I might go from here if anyone can see an avenue I have missed.I am running an XP Pro upgrade from Me and thought I would just reinstall but can not get the computer to get with the program (most likely due to operator error) Any help is much appreciated.
KennJ

Looks like one of my 256mg RAM sticks is bad . went down to one and it came up fine replaced the one with the other and nada....soooo guess I just need a new stick of RAM Guess that is why I was getting a different response from the BSOD every time it made the circuit.Thanks anyway folks
KennJ