I have a common Virtual PC 2007 problem with dual monitors for my SQL VMs... when I most need to use my Virtual PC software, often the console goes insane when using a dual monitor, and though I can limp along by using Virtual PC from the system tray, i can not run it from the console correctly. I searched for an options.xml file, but it didn't seem to exist. Turns out, the options.xml file is nicely HIDDEN in the location:
C:\Documents and Settings\(YOURLOGONNAMEHERE)\Application Data\Microsoft\Virtual PC
so I have spent hours trying to find an answer to this.
I found this entry in Options.xml: