﻿id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
12744,Error 0x000000C4 when booting Windows 7 x64 (Ubuntu 12.04 x64 host) after update to 4.3.8-92456 [FIXED in SVN],uchuujin,,"Hello!

I just encountered the following error:

- Host OS: Ubuntu 12.04 x64
- Updated Virtualbox 4.3.6-91406 to 4.3.8-92456 from the official Virtualbox repository
- Updated the guest additions too
- Started Windows 7 x64 virtual machine (was running fine before)
- The machine crashed with error STOP: 0x000000C4 upon startup

After that, I tried the following:
- the solution suggested in https://www.virtualbox.org/ticket/11841 (VBoxManage setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1)
- Downgrading guest additions to 4.3.6-91406
- Removing guest aditions altogether
- Turning off hardware acceleration (graphics, CPU)

None of this works. My virtual machine crashes everytime, so I cannot use it anymore.

Please find a capture of the error message and Vbox.log attached.",defect,closed,other,VirtualBox 4.3.8,fixed,,,Windows,Linux
