Ah ha....there were some things I left out of my problem description. I erased the demo before installing and tried both the latest patch and unpatched versions of the game. Both ways resulted in random lockups. I defrag the hd religiously and use nortons for most maintenance and anti-virus. When running SC I closed all these programs and most things running in the backround including the anti-virus. In fact all I have running is the systray and explorer and roughly 85 to 90% of system resources free. To be extra sure I have the needed memory I also defrg the RAM with memturbo before playing and then close that to. The last piece of info is that O/S is WinMe with all the latest upgrades and patches including DX-8. Other games on the hd include Close Combat2,3 and 5, East Front2, Homeworld, Medal of Honor, SPWAW, War in Russia, and Independance War2. All these games have their own full suite of mods and patches and no problems with running any of them. Those god damn russians are getting frisky on my border.I need to invade NOW!