I have have the same problem since I installed Vista Ultimate in Nov
2007. Just now, I found this link, applied the registry tweak suggested
in #6. It works after unchecking and the rechecking the referenced box:
'Windows Vista Taskbar Group (or lack thereof) - Neowin Forums'
(
http://www.neowin.net/forum/index.php?showtopic=537092)
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shug33
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http://www.vistaheads.com