The first thing to address is scanning for malware. McAffee is finding something when the color flash takes place.
It should have created a log to tell you what it found. See if you can find it.
Next, I suggest you run a Windows One Care Free Scan
Go to Windows Live Onecare Free Scan (using Windows Explorer only)
It will say "Get a free PC safety scan"http://safety.live.com/site/en-us/default.htm
Make sure you click "Full Service Scan"
in the middle of the page and not the "Try It Now Free" on the right side.
Allow it to download the Active X components.
Choose "Complete Scan" in the window that opens
Do not click on anything else that offers you a free trial or to sign up if you live in the US.
Allow it to scan - it may take quite, maybe two hours or so depending on how big your hard drive is and how fragmented your registry and drive are.
The following from Microsoft may help:
Windows Installer CleanUp Utilityhttp://support.microsoft.com/default.aspx?kbid=290301
Windows Installer download
Windows 2000; Windows XP
WindowsInstaller-KB893803-x86.exe is the redistributable package for installing or upgrading Windows Installer.http://www.microsoft.com/downloads/details...;displaylang=en
Windows Installer 3.1 v2 (3.1.4000.2435http://support.microsoft.com/kb/893803/en-us
The Windows Installer Service could not be accessedhttp://consumer.installshield.com/kb.asp?id=Q110722
Did that resolve the issue?
Edited by Enthusiast, 03 December 2006 - 09:51 PM.