From the beginning of my using Windows XP Pro SP2 on parallel over Max OS10.4.6/7, I have issues with ctrl+f3 not working. with the fn key managing software in Preferences ctrl+f2 is fine ctrl+f4 is fine f3 is fine but ctrl+f3 was not working... until one minute ago. The only thing I think different I did this morning compared to other days, is that I reduced the memory of the virtual machine from 1024MB to 512MB. I can't really reboot now to change back to 1024MB to see whether this was the issue, but I will keep posted.