VMware Workstation 4Features | Documentation | Knowledge Base | Discussion Forums
Note: On the File menu, choose Upgrade Virtual Hardware. A dialog box appears, warning that the upgrade process cannot be reversed. Click Yes to continue, then follow the on-screen directions.If you are upgrading a virtual machine that runs from a physical disk, rather than a virtual disk, you may see the following error message while VMware Workstation is upgrading the virtual hardware: "Unable to upgrade <drivename>. One of the supplied parameters is invalid." You may safely click OK to continue the upgrade process.
Virtual hardware upgrade is irreversible: The process of upgrading the virtual hardware is irreversible and makes the disks attached to this virtual machine incompatible with VMware Workstation 2 or 3. You should make backup copies of your virtual disks before starting the upgrade.