http://www.microsoft.com/en-us/download/details.aspx?id=12602

"Supported Operating System
Windows 7, Windows Server 2008, Windows Vista, Windows XP
To use Microsoft MapPoint 2011, you need:
Windows 7: 2 GB of RAM,
Windows Vista: 1 GB of RAM,
Windows XP: 256 MB of RAM
Windows Server 2008: 512 MB of RAM
Note: 64-bit versions of Windows XP and Windows Server excluded"

HOWEVER http://answers.microsoft.com/en-us/windows/forum/windows_8-winapps/mappoint-2011-issues-on-windows-8/5364643b-0f2f-4992-8a38-170b34ffddf6 seems to share a workaround.
Bob