Hi, does anyone know how to control the clock in VirtualPC 2007?

What do you mean by "control"? If you just want it not to sync with the host's clock, google: virtualpc sync clock. There's a setting for this. It will only resync when rebooting the vm, so don't reboot! By the way, are you the same malikah from the following post?
http://www.woodmann.com/forum/showthread.php?t=10243

or, write a driver to hook the clock interrupt handler. this will of course have serious ramifications, though