If SP3 was downloaded with an anti-virus, or anti-spyware, program running,
you may have a bad installation.

From: http://technet.microsoft.com/en-us/w.../cc164204.aspx

* If the configuration of your antivirus software prevents certain system
files from being changed, SP3 installation might fail. Try temporarily
disabling your antivirus software. You can usually do this by right-clicking
your antivirus program icon (which typically appears in the bottom
right-hand corner of the computer screen) and clicking Disable.

* If you disable your antivirus software before you install the service
pack, be sure that you are aware of the risks involved, and be sure to
enable it after the service pack is installed.

Remove SP3 via Add/Remove Programs, reboot and download and install it
again. Before you do, turn off your anti-virus and any anti-spyware programs
such as Windows Defender. If you use a third party firewall, disable it and
turn on the Windows Firewall in the Control Panel for the installation. Once
SP3 is in and working, you can enable the third party firewall and turn of
the Windows Firewall. Do not keep both running.

Steps to take before you install Windows XP Service Pack 3:
http://support.microsoft.com:80/kb/950717

WinXP SP3 - Read all prerequisites for a successful installation
http://msmvps.com/blogs/harrywaldron...tallation.aspx

Release Notes for Windows XP Service Pack 3
http://download.microsoft.com/downlo...1/relnotes.htm

Download Windows XP Service Pack 3 he
http://www.microsoft.com/downloads/d...displaylang=en

Free unlimited installation and compatibility support for Service Pack 3:
http://support.microsoft.com/oas/def...prid=11273&gpr
--

Bruce Hagen
MS-MVP Outlook Express
Imperial Beach, CA


"Nate" wrote in message
...
I am operating on IE 7 xp media center edition sevice pack 3. Ever since I
updated my computer to the serivce pack 3 yesterday it won't let me switch
identities. Everytime I do so, outlook dissapears and I get this message.

Outlook Express could not be started because another instance of it is
still
running on your computer. Please log off windows and then restart Outlook
Express. If the problem persists, save your work, and then restart your
computer.

At this time I then to ctr, alt, del and end the process of MSIMN.EXE and
then when I click on outlook express it will allow me to get back in. Any
ideas so I don't have to end this process everytime I switch identities?
thanks!