How to enable multiple monitors in virtual Windows XP?

[dc2000]

Hi. I'm a developer and I need to test our software in a setup with multiple monitors. I was able to do this in a virtual Windows 7 using VirtualBox, but I can't seem to find the way to do the same in Windows XP SP3. I set up "Monitor Count" to 3 in Settings -> Display -> Video and set up "virtual memory" to 64MB (it appears in green.)

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I then went to Display Option in virtual Windows XP but I can't find any way to set up multiple monitors. (See screenshot attached.)

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I then checked Device Manager in VM and there seem to be some conflicts. I'm not sure if this has something to do with my inabilility to set up multiple monitors.

Any idea how to fix this?

[mpack]

I'm not sure if it is necessary (I don't use multiple monitors), but did you install the Guest Additions?

[dc2000]

Thanks. That did it. (I'm just learning VirtualBox.)