id summary reporter owner description type status component version resolution keywords cc guest host 7594 100% CPU usage in windows XP guest converted from vmware on Ubuntu Lucid host Andrew "I am trying out virtualbox with my vmplayer VM (I uninstalled vmware tools before trying in virtualbox). I am using the repository from virtualbox.org to install 3.2 (not the OSE version) on Ubuntu Lucid 10.04. I pointed it to my vmdk file from vmware that use a native hard drive (/dev/sdb), not a virtual disk. I turned on ""Enable IO APIC"" and left most of everything else unchanged, except for adding a few shared folders and changed the network to bridged on eth0. I re-activated the windows OS. The CPU in windows is a consistent 100% with no changes at all. In the windows task manager, there have been a 3 lower CPU spikes down to ~60% but instantly went back to 100%. The OS is even slow to start, so it does not seem to be a running process. I tried to disable my firewall (norton) and the windows defender with no help. I tried running a dummy virtual box (suggested by hits found via google) with no luck either. The VM is pretty much useless as it is extremely slow to run anything. In task manager I see taskmgr.exe (ironic that the task manager is eating the CPU isn't it, but if I shut down task manager, the computer is still slow and the host reports the CPU still high) and System taking up the CPU." defect closed other VirtualBox 3.2.10 duplicate Windows Linux