Windows 10 Guest Inaccessible

[AlexB]

I installed the newly released build of VBox at the weekend and everything was running fine. However, when I opened VBox today, my Windows 10 guest was marked as inaccessible with the explanation:

Cannot attach medium 'C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso' {431cd72b-324b-4061-9d91-74de4b5d2c8f}: medium is already associated with the current state of machine uuid {170b5f15-302e-4bae-99b4-a960d284dc8f}!.
Result Code: VBOX_E_OBJECT_IN_USE (0x80BB000C)
Component: Medium
Interface: IMedium {05f2bbb6-a3a6-4fb9-9b49-6d0dda7142ac}

Any suggestions as to how to fix this?

AlexB

[loukingjr]

Start VirtualBox and go into the Media manager and Under the Optical Drive tab, remove the VBoxGuest Additions.iso. Your guest should start after that.

[AlexB]

Thank you for your suggestion but it didn't help. I eventually solved the problem by editing the relevant *.vbox file and removing the line containing {431cd72b-324b-4061-9d91-74de4b5d2c8f}.

AlexB

[loukingjr]

You're welcome. I'm not sure why removing it from the media manager didn't work however. Glad you got it fixed though.