I think I have seen this problem with AMD processors on PC's...

When AMD Processor/Timer Driver/Fix installed.

If you have AMD processor with timer/driver fix installed, try removing that
driver.

Otherwise I dont know... but could be any other driver messing up the
shutdown.

Actually I have some shutdown problems as well.

Creative Labs drivers always crash on shutdown and then I have to press the
OK button, otherwise it wont shutdown.

Sometimes Microsoft's stuff crashes as well... same thing I press ok and
then it shuts down.

But it shutsdown pretty fast ;)

Bye,
 skybuck.

Actually one minute or so isn't that long. I've seen people that have
to wait upwards of five minutes.

First get into the habit of closing down all your applications
manually BEFORE you shut down. Don't let Vista do it itself that
always takes longer.

By default Vista is designed to wait 20 seconds before it kills a
service. This is to ensure whatever some application is doing doesn't
get slammed before it is done writing data out to the file system. If
you have multiple applications running and depend on the OS to shut
things down it will wait and wait until the application signals it
that it is finished. Sometimes the system hangs and Windows won't
shutdown. You usually but not always see some message such and such
isn't responding. Other times there simply are a lot of memory pages
which may be holding things up, so just wait.

There is no set time Vista should take to shutdown. On my system it
varies greatly depending on what I was doing. If I had a hard busy day
it generally will take upwards of a minute. On less busy days it shuts
down in about 15 seconds. Bottom line, if it is under two minutes I
wouldn't worry about it.

Roque;716804 Wrote:

Hello Roque,
If this "slowness" happens after SP1 installed, you might want to
contact MS help & support. They are offering free e-mail support, chat
support and phone support. Click the link below, look under Update Vista
heading, click "Free support for Windows Vista Service Pack 1 issues",
then pick your choice of support.

'Windows Vista Solution Center'
(http://support.microsoft.com/ph/11732#tab0)

Roque;716804 Wrote:

Hi Roque,

In addition to the other posts, you might try this tutorial to help
speed up the shutdown time.

http://www.vistax64.com/tutorials/70567-shutdown.html

Hope this helps you,
Shawn