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Lets say I have 2 windows dual booting on the same harddrive (windws 7), How isolated are they?

I am thinking that there should be up to date antiviruses software on both Windows, and they should be different software so that each one can pick what the other missed.

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Well, they aren't isolated at all if they can both see the hard drive.

You are correct that they both should have their own anti-virus solutions though.

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Could you elaborate on why each should have its own AV? Is it required only for real time checks and locked files, or am I forgetting something crucial? –  Henning Klevjer Feb 12 '13 at 19:26
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Whichever one you are running will need to be able to check new files etc., as if only one has AV and it is not the one booted then you will not get protection. –  Rory Alsop Feb 12 '13 at 21:31
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The only code in common should be the bootloader. One of the Windows installations will have a bootloader that allows you to toggle which Windows installation you boot to. Some rootkits inject themselves into or below the bootloader, so a single infection from that would probably be present for both operating systems.

Aside from that, the Windows installations should operate independently. An infected Windows install would only directly infect the actively running Windows installation.

But they won't be actually seperated. If they're on the same hard drive they will be able to see and access each other, so one infected install certainly could detect and infect the other Windows install. (And it is probably easier to infect a system that isn't running than one that is.)

Both should be protected.

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