I understand The Horde by Crystal Dynamics only sometimes runs in DosBOX 0.63. When I try running The Horde, and it's just a black screen, sometimes I'm curious as to how much processor usage DosBOX is consuming, so I press CTRL-ALT-DELETE to bring up the Task Manager. DosBOX immediately posts "Exit to error: CPU:GRP5:Illegal Call 7" to the text console, and both windows silently disappear after a couple seconds. The Task Manager does appear correctly.

In the text console, there are two spaces between "Call" and "7" in the error message.

I am running Windows XP Pro with dual AMD Opteron 1.6 GHz processors, 2 GB RAM. My motherboard is a Tyan Tiger S2466N-4M.