Vista - Logon Problem After Vista x64 SP1 Installed

I installed SP1 for Vista x64 the other day and have encountered the following
problem since then:

Computer boots up fine and allows me (or the other user) to logon without
difficulty.
After logon all works as expected.
I will then 'switch user' and my wife will logon
Then we get a problem (same problem presents itself if she logs on first,
then logs off and I log on, or we switch user, basically problem presents
itself when first user 'switch user' or' logs off' and another user logs on,
the problem is with the second user; interestingly, the problem also occurs
if I log on, log off, then log on again! Problem only solved after a system
reset).

The logon begins and the desktop appears.
It seems to me like the desktop will not refresh properly. The gadgets do
not appear; I can no longer single-click a desktop icon (have to
double-click); the taskbar remains in the up position (won't auto-hide) and
when I do launch a program the button does not appear in the taskbar; the
taskbar icons do not appear in the taskbar. All these problems could be
caused by some sort of video card problem, maybe? Anyway, my computer specs
are below.

Windowes Vista Ultimate x64 SP1 (licensed copy)
Intel Core 2 CPU 6600 @ 2.4GHz
4.00GB RAM
Nvidia GeForce 7950GT (latest driver)
Motherboard - Gigabyte 965P-DQ6

I have completed some initial research on this problem without success.

I'm also seeing problems with sleep that seem similar. I think it's a bug in
Aero. Test your results with "Classic Windows" theme to find out.

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Mark L. Ferguson
..

"Wylee" <Wylee@xxxxxx> wrote in message
news:C6908C91-0FCB-492B-A6F1-D45BA61AC017@xxxxxx

Wylee,

There is free Microsoft tech support for SP1. You can access it here: https://support.microsoft.com/oas/de...4&gprid=500921

I hope this helps.