It may have coincided with the malware, but a Windows Installer popup is not typically a sign of infection by itself.
http://www.google.com/search?q=Windo...taller%20popup
Please do this:
Go to Start>Run and type or copy/paste
services.msc then press Enter
Scroll down and locate Windows Installer.
Double Click on it.
Tell me what the Startup Type and Service Status is.
See this link for MS description of this issue:
http://support.microsoft.com/kb/555175/en-us
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