Are you logged into a domain?
Apparently when logged into a domain, Vista expects the domain to handle it. Log out and log in using a local account on they system. The tab should be back.
ETA: Or - start an elevated command line (right click on "command prompt" in the start menu and choose "run as administrator", then enter "net time /setsntp:[time server]"
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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