id summary reporter owner description type status component version resolution keywords cc guest host 9160 Guest Additions cause Windows 7 to hang on startup Gord Gray I installed 4.0.10 on Windows 7 host. Linux guest works fine, one of the Windows 7 guests works fine, but my second Windows 7 guest started hanging on startup after I installed the Guest Additions. Using the Launch Repair Startup built into windows to revert the system back made the startup problem disappear. Let me know if there is more information you need that might help. defect closed guest additions VirtualBox 4.0.10 obsolete Windows Windows