Parallels was working great for my MacBook up until a few days ago. Now, when I try to start it, I get a message reading "Virtual machine cannot be started because of the following problem: Parallels Desktop is unable to access the virtual hard disk image file/Users/jolenesy/Documents/Parallels/Microsoft Windows XP/winxp.hdd. The file is used by other application." I tried closing other applications and restarting my computer to no avail. Any help would be appreciated!