For the sake of testing our product(krugle) easily, I installed VMWare ESXi 3.5.0 build 153875 on a HP laptop(HP 520) before the new server is delivered to our office, but unfortunately it failed to work, for several times it just threw me a screen with purple background, which is much like M$'s famous blue screen ;) it said "PCPU 1 locked up. Failed to ack TLB invalidate...", here is one of the screenshots I took when the errors occurred: But I was not surprised at all, because I knew there were problems with the HP 520, at least with this model of HP 520.