We were out of town for about 10 days recently and upon return I restarted the machine and everything appeared to be running normally. I also installed the Aeroplane Heaven He-111P into my FSX. After that evolution I've gotten several instances where the sim locked up during use, or the machine has locked up even after the sim is shut down. I have Avira running here and one of the things I'm using is a service of theirs that checks startup functions and tells me how long it's taking for the machine to start. The last run was 250 seconds. Avira says the startup is optimized already. The AH He-111P has been removed from FSX and I've got an email in to them to determine what could have caused the shutdowns after the sim was closed out. Has anyone experienced a similar problem due to restart after being shut down for a while - or after adding a particular aircraft or scenery?