Upgraded my RAM from 512M to 2GB... no difference. The FS-ONE program dies when I actually try to start flying from the selection(airplane/transmitter/field) screen. The FS-ONE window just disapears and I am back to a normal desktop with no FS-ONE running at all. I beleive after much testing that FS-ONE is one of those windows programs that must run as a priviledged account (administrator/poweruser) and will not run as a limited account - that is simply unacceptable with a kids. IMHO as a 25 year IT professional - this is a huge flaw and I would never have purchased the product if I had known this. The only way I can get the program to run for my kid is if I open it for him with "RUN AS" from my account. Horizon hobby technical support has offered me no help during a phone conversation nor do I expect my email to be answered with anything helpfull. As a long time JR user and believer in Horizon Hobby products quality - I couldn't be more disapointed at this time. Hopefully I can find a way to make this work without having to sell it on EBAY and purchase a different SIM.