FS9 doesn't shutdown properly

Hey guys,I have the following problem:When I exit out of FS9 via the menu option or the button on the top right corner my system comes to a complete crawl until I restart my computer.When this happened I immediately opened the task manager and I couldn't find anything wrong there was no fs9.exe listed in the processes and both my CPU and Memory usage were normal. What could of caused this?Windows Vista Home Premium 64-bitIntel Core i7 920 @ 2.66GHz6GB Samsung PC3-8500FATI Radeon HD5870 w/ Catalyst 10.12500GB Seagate Barracuda 7,200 RPMFS9.1 + PMDG 747-400/F + FSUIPC 3.9.8 (unregistered)