virtualbox.org

VB will not load any machines hosted on win 7 64bit using versions 4.3.20 down to 4.3.14. It runs with 4.3.12. I've looked at the other post about version 4.3.20 and 4.3.18 and I do not have KB3004394 installed. Is there any fix to this issue? As of right now I'm limited to version 4.3.12.

Take a look at the discussion: Windows 4.3.20 specifically for errors due to security. It's not just about KB3004394. Mostly it's antivirus and theme-changing software. The KB3004394 was a late arrival and Microsoft has reversed its application.