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This is almost certainly a dumb question, but... say I have Windows 7, with some anti-virus software installed, and I am using Microsoft's Windows XP Mode to run some legacy applications as well. Is there any reason why I would want to install an anti-virus program in XP mode as well?

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up vote 4 down vote accepted

Not a dumb question at all.

XP Mode is another virtualized environment. If you will be utilizing applications inside it that are accessing the internet, it would be a smart idea to protect it. Your anti-virus on the Windows 7 host can only do so much, you'll need to install separate protection in XP Mode if you want the additional security. I'd recommend doing so.

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I agree, first thing I did after setting up the XP mode was to patch it all and install Microsoft Security Essentials on it. –  Nick Josevski Mar 2 '10 at 6:11

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