Question : two copies of msiexec.exe running continuously

Hi,
I'm having problems running some installations on my Windows XP SP2. I get the following error message:

Error 1500: Another installation is in progress. You must complete that installation before continuing this one.

I updated and ran avast antivirus and spybot. I googled and tried some of the solutions. None of them worked but I noticed in the Task Manager that two copies of msiexec.exe are running continuously, and start up again as soon as I end them.

Can someone please help,

Thanks.

Answer : two copies of msiexec.exe running continuously

Oh yeah, I forgot about that. See if this works:
http://www.ee-stuff.com/Expert/Upload/getFile.php?fid=5818
It's from the installed program on my computer.
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