[Users] best disk type for WIn XP guests

Hello, I have a WIn XP guest configured with one ide disk. I would like to pass to virtio. Is it supported/usable for Win XP as a disk type on oVirt? What else are using other ones in case, apart IDE? My attempt is to add a second 1Gb disk configured as virtio and then if successful change disk type for the first disk too. But when powering up the guest it finds new hardware for the second disk, I point it to the directory WXP\X86 of the iso using virtio-win-1.1.16.vfd It finds the viostor.xxx files but at the end it fails installing the driver (see https://docs.google.com/file/d/0BwoPbcrMv8mvMUQ2SWxYZWhSV0E/edit ) Any help/suggestion is welcome. Gianluca