Re: Video playback
Windows XP is only available for the X86 and X64 (IBM PC) architecture - NT 4.0 was the last old MSFT OS compiled for a non-PC platform (DEC Alpha). WinPhone and Windows 8 RT run on ARM but they're pretty thoroughly locked down to Windows-specific hardware. The new R-Pi will probably run Android rather well, but with less functionality/support than Raspbian or XBMC.