I've installed a copy of Windows XP Professional on VirtualBox, placing the virtual disk on an external USB HDD. I installed it to be able to play Chessmaster 9000, but upon attempting to install, the installer exits, stating that a debugger had been detected and to unload it.

Any ideas?

I've tried using VMWare to install Windows, but it is very sluggish and crashes randomly. Plus, VirtualBox is faster.

P.S. I did search the forum. I found inconclusive topics and decided to start a new one. The last one dates over half a year ago.