I uninstalled an application from my X64 Vista Ultimate workstation. The uninstall routine left pieces of the application. So I edited the Registry trying to remove the remaining entries. Either I was not paying attention, or this vendors name appears in Registry entries used by the system, for items were missing from the Control Panel and the System Restore lost its GUI.
I restored the entire C: drive from the latest backup on WHS taken at 1:40 a.m. the same day.
Everything came back! Even the time was sent to the time of the restore.
I'm very happy to say that WHS worked as documented.
WHS: HP EX-470 with 4 drives.