Game Crashes in Mainquest (around Lv45)

[BFG5000]

Hi everyone, i played Planet Alcatraz a lot in the last time
and i hope someone can help!

My Characters are now Level 45
(i will explain a bit, maybe the situation will be clearer then)
and i stucked on the Mainquest.

I hunted these big birds with this chinese guy.
After that you must go to this guy in the woods (Old Druggist,i forgot the name)
and he will give you another quest item in exchange for the bird gland.

Now i traveled to Andre in the small village, he talks something
about that the next stage is very well guarded...

a cut scene occurs and sullen is going to take a look around at
the rocket construction site.

Then the game loads the Northern City, with a cut scene with boar and sullen.
After approx 2 seconds the game freezes and i get some back-to-desktop-fatal-error.
Anyone else?
My OS is Win Vista Ultimate 64bit...

Could someone confirm that this is not occouring on WinXP(32bit)?
So maybe i could go ahead with the savegame on my notebook...

thx in advance