Vista Start Menu pop-out menus non-responsive

[Guest]

On Monday, I installed Windows Vista (Business) as a clean install. All was
fine.
Now that I've finished installing my software (Office 2007, Visual Studio
2005 - with the Vista service pack, SQL Server 2005 SP2, Symantec Antivirus
10.2 client) and had all the updates from Windows Update installed, all the
menus that pop-out to the right of the start menu (Favorites, Recent Items,
Administrative Tools, and the Shut Down/Restart, etc.. menu) don't work!
They appear normally, but nothing is selected as I hover over items and if I
click (either button) the menu just disappears.
I have tried enabling single-clicking and double-clicking. I have tried
switching to the 'Calssic Menu' (which works fine), but when I go back to the
Vista menu, it's a no-go.
Has anyone had/heard of something similar? Do you have a solution (other
than re-installing everything again!).

 

[Guest]

Thanks for the response and suggestion, brink!

I had tried restarting the machine several times (I'm used to that after
years of experience with previous versions of Windows ;-)). The problem
persisted; however, shortly after I resorted to posting my problem here,
explorer.exe crashed. Upon restart, Vista itself deirected me to KB941649. I
installed the update and the problem has gone away.

BTW.. as far as restarting the machine, which was a necessary and extremely
frequent activity with Win95, and 98, and NT4, I found Windows 2000
incredibly stable (running for months at a time without having to reboot). XP
was pretty good too, but not as stable - "The system has recovered from a
serious error" messages appeared a bit too often for comfort. Too early to
tell regarding Vista, but so far I'm very pleased.
RJM