id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 824,The VirtualBoxservice.exe uses 100% CPU in the Windows 2000Pro or XP Pro guest VM -> Fixed in 1.5.4,Ralf,,"I had created a Windows 2000Pro and Windows XP Pro guest VM under a Windows XP Pro host - using VirtualBox 1.5.0 When VirtualBox 1.5.2 came out I uninstalled VirtualBox 1.5.0 - installed VirtualBox 1.5.2. Than I uninstalled the Guest Additions 1.5.0 in the guest and installed the guest additions 1.5.2. Now I have the problem that often - not always - my CPU usage is 100% assigned to the VirtualBoxservice.exe in the guest system! Shocked You can shut down the service and the guest still works but with normal CPU usage OR ... Open the Services from the Windows Configuration in the guest, scroll through the list, close it again and suddenly the CPU load for the VirtualBoxservice.exe goes down to a normal level again. Strange behaviour Evil or Very Mad But chances are still hight that CPU usage reaches again 100% later on. I posted this in the forum first and so far at least one other user can confirm this.",defect,closed,other,VirtualBox 1.5.2,fixed,VirtualBoxservice.exe,,other,other