virtualbox.org

I already have Windows XP installed with Boot Camp.
Do I need to re-install Windows in a new virtual drive or can I "link" Virtual Box tot he exisiting Windows program?

Have a look at this stickie.
http://forums.virtualbox.org/viewtopic.php?t=9697

Also, please give a little more information about your problem in the subject of your post. A generic subject like "Installation" will cause most people just to go past your thread without reading it.