Windowx XP SP3 + all hotfixes to 5/12/2011
Total size: 250MB (500MB after installation)
VirtIO net drivers and TCPIP.SYS without limitation

This is special version for QEMU/KVM virtualization.
(requires legal licence from Microsoft ofcourse)

There is strange bug in VirtIO Net Drivers
(MTU set only to 1500 and OffLoad TX LSO must be set to off)

There is little issue with shiny new Windows 2008 Server and Windows XP workstation not logged to domain. Because of “force guest” isn’t working by that way and you must disable it.
So you can easily import this reg file and everything may be OK.