SunBird don't start

Hi,

I just downloaded SunBird and extracted on XP (Virtual PC 2007) machine. When I try to run it, I get the splash screen for a moment and then nothing. If I check in task manager, I see the executable running for a second or so.

If I copy the folder to the host machine (Vista 64 bit) then it runs.

Is there something I can try / debug to check what is wrong or has someone else ever had this problem?

thanks, Wilfried