FSX Acceleration Problem

[Harris]

I was experiencing freezes while running FSX and FS Acceleration. I uninstalled all.  I attempted  a squeaky clean reinstall.  New installed FSX would run fine.  When I re-installed Acceleration I was never asked for the Product Key. I know now that this is not untypical of this expansion pack.  I soon noted that the Accel. aircraft had not been installed, however SP1 and SP2 were installed.  When I ran FSX I had similar freezes as before. I uninstalled and re-installed using the registry fix.  This time I was able to enter the Product Key.  Still had the same freezes. Still no A/C. I have done this three times.  Same thing each time.  I do not have a temp problem and the same problems appear either with the overclock or default CPU.

I am hearing impaired which rules out a MS Tech on the phone. (I  doubt that they would know the fix.  This evidently is a fairly common problem so why not a fix?)  The online MS trouble help is a joke.  Does anyone have a solution to this?

Intel e6600 Core 2 Duo @ 4.00GHz
Noctua NH-U12P Cooler
ASUS  P5Q Pro
OCZ Reaper 2X2GB DDR2 800 (PC 6400)
EVGA GeForce 8800GTS 640 MB
WD 250GB  GB SATA II
Corsair CMPSU 550W
Windows XP home

[RaptorF22]

I'm not quite sure why this would happen, but when are the crashes occurring? While FSX is starting, in the menu or while flying?