I don't think I have a virus; in any case it's not a one that my antivirus software can detect. It happened once while clicking the desktop shortcut to start the game, and after that it's happened while loading a new area, such as when I enter or exit a battlefield. It's pretty bizarre. I've gotten crashes-to-desktop with BD in the past but nothing like this.
Oh, and it only happens while playing BD. Never shuts down on its own otherwise.
Technical information:
OS Name Microsoft Windows XP Home Edition
Version 5.1.2600 Service Pack 1 Build 2600
OS Manufacturer Microsoft Corporation
System Manufacturer NVIDIA
System Model AWRDACPI
System Type X86-based PC
Processor x86 Family 6 Model 10 Stepping 0 AuthenticAMD ~1843 Mhz
BIOS Version/Date Phoenix Technologies, LTD 6.00 PG, 10/2/2003
SMBIOS Version 2.2
Hardware Abstraction Layer Version = "5.1.2600.1106 (xpsp1.020828-1920)"
Total Physical Memory 512.00 MB
Available Physical Memory 336.46 MB
Total Virtual Memory 1.72 GB
Available Virtual Memory 1.42 GB
Page File Space 1.22 GB
Page File C:\pagefile.sys