Bug Fix "Failed to open session for virtual machine"

Computer users who are trying to run an operating system on VirtualBox may encounter error 0x80004005: "Could not open session for virtual machine." This article will explain in detail how to fix it. Fortunately, there are many ways to do this.

Method 1: change file names

This method will help to correct the error - “Could not open the session for the virtual machine” in the event that the previous session was not completed correctly. This problem is fixed easier than ever - you just need to rename some files.

1. First you need to go to the folder where the files with the VDI extension are located - this is the image of the operating system itself. This directory is often located in the VirtualBox VMs folder in the root of the disk. If you did not find it there, then follow the path C: \ Users \ owner_name \ .VirtualBox C: \ Users \ owner_name \ VirtualBox VMs \ OS_name.
2. There will be two files in the directory with the extensions VBOX and VBOX-PREV. Immediately create a copy of the VBOX file and move it to another folder.
3. Now rename the file with the extension VBOX-PREV, removing the last prefix. That is, as a result, instead of VBOX-PREV, you should have a VBOX extension.
4. Now go to this folder: C: \ Users \ owner_name \ .VirtualBox and do the same, only with the XML-PREV extension.

After that, the error should disappear.

Method 2: update VirtualBox

Perhaps the message "Could not open the session for the Windows 7 virtual machine" appears because your program is outdated or, on the contrary, has been updated to an unstable version. In this case, you need to update it.

1. Log in to the VirtualBox official website.
2. Follow the releases link.
3. Choose the version of software that suits you.
4. Download and install it.

After the program should function properly.

Method 3: turn off hypervisualization

First, it’s worth explaining that Hyper-V is a virtualization system that is used in 64-bit systems, so this instruction will not help users of 32-bit computers. This system may conflict with the program, which is why an error appears. So here is what you need to do to solve the problem:

1. Open the Control Panel.
2. Go to "Programs and Features."
3. In the window that appears, click on "Turn on Windows Components."
4. Find Hyper-V in the list that appears and uncheck it.

Then it remains only to restart the computer, and after entering the desktop the application should function without problems.

Conclusion

Three methods were listed above to fix the error 0x80004005 in VirtualBox. Of course, these are not all methods, but they should be enough for you, we hope the article was informationally useful for you.