Virtual Machine is inaccessible because of "VBoxGuestAdditions.iso"

[adam]

When i go into virtualbox i get an error that vista is inaccessible. the problem is that when you mount an ISO to the virtual drive it saves that you wave added it before in the log! i unmounted the disk before closing virtualbox down but its still inaccessible. i can delete the line that says location="C:/Program Files/Oracle/VirtualBox/VBoxGuestAdditions.iso" but when i restart virtualbox another virtual machine is having the same problem. In the next release of virtualbox you shouldn't save the disks that you have used in the past because it doesn't work this way.

Screenshot: ​http://i989.photobucket.com/albums/af17/adamjoh/Probs/vboxprob.jpg