fsx locks up after playing for more than 15 min

The chances are that your computer is overheating.
Open it, clean the dust out of the fans and especially the CPU.
If you don't know how to do that please ask.

Also check this out.

http://support.microsoft.com/kb/892610

On the chance that this doesn't do it, then list your system specs and we can go from there.

rlaz1 wrote:

I need some help please. while I am flying in FSX my system locks up after around 15 to 20 min I also get a not enough memory to run fsx message?

Thank you,

I had this problem, and it was solved with getting more memory 4gigs now.
When this occurs, it mean that FSX has used up all your pc's recources so it just quits when it can't handle anymore.

But once i got more ram, i can now fly flights up to 8 hrs or more.