Have Accel Pack, add-ons now crashing simulator

Since loading the Acceleration Package w/SP2 and FSX Deluxe, with the add-ons, all I seem to be getting is the message that I have encountered a 'Fatal Error' and do I want to send an error report to Microsoft?
What have I done wrong? With the FSX original I did not get nearly the amount of add-on planes that I could use with SP2 but I did not get the 'Fatal Error' message hardly at all, now all I seem to get is the 'Fatal Error' message and not nearly enough flight time as I used to.
Please advise me on the problem I have encountered and the fix.
Thank you ever so much, yours is the most welcoming forum on the web and I would rather head here for answers than any where else.