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I have a clean install of Windows 7.

I downloaded Microsoft Security Essentials from the Microsoft website, and attempted to install it, but at the end of the installation wizard I get the following message:

"Can't complete the Microsoft Security Essentials Installation Wizard". "An error has prevented the Microsoft Security Essentials Installation Wizard from continuing.

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Does it show up as installed in the control panel? – soandos Nov 28 '11 at 20:42
Have you tried downloading it again and reinstall it? Might be a corrupt install file. – CharlieRB Nov 28 '11 at 21:55
up vote 1 down vote accepted

In the end I just reinstalled Windows 7 and then tried to reinstall Microsoft Security Essentials and then it worked. There must have been something wrong with my Windows install. Thanks anyway guys.

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