Now somebody tells us! 
I have played SH4/U-Boat missions from Dec 7 all the way to the end of the war with 90% of the video features on and never had a crash. Finished my career, played quick missions and war patrols and never had a crash or any problem.
Trouble started after I downloaded the latest video driver from Nvidea. While playing SH4 I suddenly started to have "sorry SH4 must close due to unknown problems". I sent the error reports to MS. Never got any answer. Then I started to get B.S.O.D.s and windows would recover from a serious problem.
No other application or game would crash my system. Just SH4. After much hair-pulling, debugging and unistalling/reinstalling of SH4 I decided to roll-back my video driver. Lo and Behold the trouble went away. No more system crashes.
Proof that new isn't always better
