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I'm setting up a computer and am just curious if Windows XP Mode can become infected with a virus that will harm the Windows 7 host?

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up vote 2 down vote accepted

Yes it is possible but not for the argument of the virus file is into the host filesystem, that is very unlikely possible.

The separation is the same in XP Mode or VMware Workstation for the virtualization architecture.

It is possible though, and much more in XP Mode than other virtualization technologies because XP Mode maps the real file system to the VM. In fact if you use an app in XP Mode and using that open the documents folder, you will see your host OS documents, not the VM folder. This was done to give the user a better experience.

Microsoft recommends to have an antivirus installed in XP Mode. Microsoft Security Essentials is supported and works like a charm in XP Mode.

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Yeah, XP mode is purely for convience. – surfasb Oct 12 '11 at 1:02

Sure. If a virus makes it into the host filesystem and that file is then read / interpreted / executed from something on the Windows 7 side then there's the potential for infection.

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So there's not quite the same separation as there is in running a virtual machine in VMWare? – Mike Hagstrom Oct 11 '11 at 20:25
There is less separation in VMWare (and other hypervisors) than you are thinking. There is still the potential of a VM in VMWare or VirtualBox or whatever infecting the host. There are viruses now that can make use of some of the virtualization internals to leak themselves out to the host. But also, the host filesystem is easily accessible by the guest OS in most cases. – squillman Oct 11 '11 at 20:29
@squillman: Those are rare and are about as likely as a meteor hitting your house. – surfasb Oct 12 '11 at 1:01

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