I've been running V4 just fine (build 5582 is the most recent download, so I think that's what was running great before the attempted upgrade). I'm running OS 10.5.8 on a Mac Pro with 2x2.66 GHz Dual-Core Xeon processors and 7 Gb RAM. I bought the upgrade and got through registration and tried to boot XP as normal - expecting to go through the normal tools install. No luck. I can't get Xp to boot. I get an blue screen error message that goes by too fast to pick out and then get presented with options - boot normally, safe mode and a couple others. None allows the boot to proceed to completion. I tried re-installing V5 and the same result occurs. All previous upgrades since v3 went fine.
