Okay I got Virtual Box. Is it free, I was told there is a free and propritory version. Is the propritory one still free, just not open source?

Anyways, I have an OS called Crystal XP, which is essentially a modified XP. (Has themes). I was running this in VM Ware. When I tried boot add the hard drive I installed it to in virual box it crashes on boot, and then says that windows failed to start and asks me for safe mode etc. It just crashes again.

I assume this is becuase my VM Ware hard drive file is split and maybe Virtual Box wont read it.

Should I just stick with VM Ware? I like the sound of virtual box since I wanna make a Virtual Machine and then just run it from a Windows or Linux host OS.

Also can it run Mac OS X?