id summary reporter owner description type status component version resolution keywords cc guest host 207 Installing guest additions on the host causes problems and should not be allowed ghr "Host: WinXP SP 1 UK with KB889293 (512 MB RAM, 80 GB HDD) Virtualbox 1.3.8 from VirtualBox_1.3.8_Win_x86 Guest VM created: DOS6.2/Win3.11 (16MB RAM; 500 MB HDD) Guest Addition from the same install kit. After install of Guest Addition & reboot: WinXP host machine reboots on 1st mouse movement. Workaround: Mouse disconnected; keyboard control ok. WinXP host 'repaired' with WinXP system restore point (which by the way removes VirtualBox including installer file). " defect closed other VirtualBox 1.3.8 fixed host reboot guest addition mouse other other