I am running an alum iMac, late 2007, with OS X 10.4.11. I use XP as my virtual machine. I've had zero problems switching between OS X and XP for 2 1/2 years. Suddenly I can't start up my XP computer. I get the message "The Alias 'Microsoft Windows XP.pvs' could not be opened because the original item cannot be found." The error window gives three options: Delete Alias, Fix Alias, and OK. I'm not that adept, so if someone could give me some simple help I would be grateful.