Hi, We've had to upgrade our laptops as part of an overhaul of the IT here, and have all new dual CPU x64 units now. All are running Vista64 business, but no-matter what version of SA I install it just returns a Windows fault of "System architect has stopped working" every time i attempt to run it. Even with XP compatibility running, still no joy. Basics are can and does SA work with Vista64, or not... we don't have issues with any other manufacturers products, and SA does seem to work on an XP64 machine we have here tho. Any help would be greatly appreciated. Chris.