Can't install Windows Defender



Windows XP Home SP 2:

After performing a virus scan and removing 29 virus/trojans and a worm,
I am trying to install Windows Defender after a reboot.

Because of the long delay after first trying to launch the setup,
with no indication that it was running, I launched it again.

Soon I was notified that i could not install that second instance, etc because setup is already running.

After another reboot, and being careful to have only one instance running,
I still have the same problem. It says"Another installation is in progress. You must complete that installation before continuing this one."

Add Remove Programs
has no Windows Defender in it.

Using "Sysinternals Process Explorer" I see only the on instance of msiexec.exe running and it is the one showing the message.

Appropriately closing all the windows causes the msiexec process to vanish form the process explorer window. I see nothing else to suggest setup is running anywhere.

I launched "Windows Installer Cleanup"
and I gat a similar message:
"Error 1500. Another installation is in progress. You must complete that installation before continuing this one"

Now I am thinking the problem is not a Windows Defender install problem. SOmewhere there is a flag indicating installation in progress.

How do I fix this?

feeling dumb about now
.



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