Vista Tutorial - Vista Long boot times after FSX crashed due to DEP

I have installed a fresh new copy of VISTA ULTIMATE and FSX. When using FSX
it has been crashing lately and the DEP (DATA EXECUTION PROTECTION is being
activated). When I visit the VISTA CONTROL PANEL for DEP it does not allow me
to add FSX to the safe list. Sometimes I even get the BSOD and my computer
reboots. I have no third party applications installed. Here is the error from
VISTA reporting utility.

After this happened it takes about 5 minutes for VISTA to boot and my screen
stays black for this period of time. I just hear the hard drive caching.

Product
Microsoft Flight Simulator®

Problem
Stopped working

Date
5/3/2007 4:57 PM

Status
Report Sent

Problem signature
Problem Event Name: BEX
Application Name: fsx.exe
Application Version: 10.0.60905.0
Application Timestamp: 44fd0a92
Fault Module Name: StackHash_cebf
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Offset: 0c69e000
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.0.6000.2.0.0.256.1
Locale ID: 1033
Additional Information 1: cebf
Additional Information 2: a2d8f70406b1dc588d67f49157436f3f
Additional Information 3: d75b
Additional Information 4: 605db4bbae3182e500cb2af41e941bc2

Extra information about the problem
Bucket ID: 36309056