Hello,I have the following add ons other than add on scenery from the generous authors here my payware includes FSG all mesh ect, UT USA, and BEV all season's. I have also had the "sandwitch" in the add on scenery section as discribed in the commercial review area on this great site.Here is what happens, I start up the Sim per all the instructions and after about 5 mins to 15 mins (It is always unpredicable) the Computer just seems to freeze up. There is also a rather high pitched sound over the speakers when this happens.To fix the problem I must restart the Computer with the button on front of the tower as the mouse and any key strokes are also "frozen".This is the very basic way that I know of to discribe the issue.I have tried re-installing, De-frag ect.. as well as took the Computer to a shop to have a new hard drive installed (thus the re-install). No other program dose this type of behavior and I am really at a loss. I sure could use some advise.I hope I did an adequate job in summing the issue.Thank you.Mark.System:OS:MS Windows XP Professional, Ver 2002 Service Pack 2 Hardware:Intel Pentium® 4 CPU 2.802.84 GHz, 3.00 GB of RAM Radeon X1600 Pro 512MB running a 21/19.6 Sony Flat Screen Tubed Monitorand a 17/16 NEC/Mitsubishi Tubed MonitorGeForce FX 5200 128MB running a NEC/Mitsubishi 18 Flat Panel

Hey Mark; Check the Num Lock and Caps lock key lights: if you are unable to turn them on or off when the problem occurs - then it's very likely a hardware issue - and probably pointing to a failed memory dimm.

Hi Mark,Same problem here but only with one AC Captainsim C-130.//Svend

Hello PualJ and Svsnd.1st. I am unsure what a "failed memory dimm" is. I had both hard drives replaced, all new V cards and the kingston mem sticks ect ect the only thing left would be the mother board. I guess the other would be the P4 chip, other than that well I am at the end of my rope as in ready to get a new machine some time later this year. Also, yes when it freeze happens the keyboard and mouse also are frozen.Thank you.Mark.System:OS:MS Windows XP Professional, Ver 2002 Service Pack 2 Hardware:Intel Pentium® 4 CPU 2.802.84 GHz, 3.00 GB of RAM Radeon X1600 Pro 512MB running a 21/19.6 Sony Flat Screen Tubed Monitorand a 17/16 NEC/Mitsubishi Tubed MonitorGeForce FX 5200 128MB running a NEC/Mitsubishi 18 Flat Panel