Since installing 5608 I get the following message after starting my Virtual Machine: System Extension cannot be used! The system extension "/library/filesystems/fusefs.fs/support/fusefs.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update. What does this message mean and how does it affect my system? What should I do to correct this error situation? It does not appear to create any real problems because after I click "OK" it goes away the system boots normally and I cannot see any deleterious affects of the error. Patrick Toomey Charlottesville, VA PS: I am using a 20" iMac, with 175 GB of free disk space, 3 GB of memory. I run Mac 0s 10.5.5 and have allocated 1 GB of memory to the Parallels VM and am using Windows XP home edition.