SoftICE crashing on Windows 2003

Now I'm completely confused. I installed WinXP and Win2003 on a different PC. I also installed SoftICE on both PCs. The interesing point is that SoftICE loads on WinXP and Win2003.

Then I checked the part where SoftICE on Win2003 crashes on the other PC from Ring-0. (the code from above)

On WinXP, [EAX+44] points to some other memory location, so [EAX+18] can be read normally.

On Win2003, [EAX+44] has a value of NULL, so reading [EAX+18] will crash the computer.

The code crashing my computer crashes it always on Windows 2003, but for some reason it is not executed on one of the PCs.

Both computers have a totally different hardware configuration (chipset, count and manufracturer of CPUs, installed RAM), but the software is the same (expect for the hardware drivers).

Has anybody some other idea what the source of the problem might be?