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you could disable anything security related: antivirus, firewall, anti-spyware, etc. Norton, Kaspersky, Trend Micro, Black Ice, Aluria, Spyware Doctor, Microsoft Anti-Spyware, Spybot, Black Ice, Zonealarm, and a long etc.
Some start automatically when you boot up and keep going even after you disable them (like Black Ice Firewall), so before diabling anything you might:
Run: msconfig and look in the Startup Tab and uncheck anything security related.
That doesn't disable currently running programs--it prevents them from starting automatically after rebooting. (Norton's programs are under Symantec, BTW. Google program names that aren't obvious--ignore the sales pitches for WinTasks or whatever.) Unless all your startup items are currently checked, make a list of what you're unchecking so you can add them again next time around--their order will change. (If they are all checked, you can just recheck them all, of course.) APPLY, disconnect from internet and reboot with those items unchecked.
Then try the installer and see if something was getting in the way.
Run: msconfig again, recheck what you unchecked and reboot before going online again.
