Swapped location of Win7 guest ISO, now Virtualbox can't find it.

[Lava]

I have a Win7 guest VM on an Ubuntu Linux host. I moved the Win7 ISO that I used to create the VM from one folder to another, and now I get this error in Virtualbox:

Failed to open a session for the virtual machine Win 7.
The virtual machine 'Win 7' has terminated unexpectedly during startup with exit code 1 (0x1).
Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
MachineWrap
Interface:
IMachine {f30138d4-e5ea-4b3a-8858-a059de4c93fd}

Was this in fact due to me moving the ISO somewhere else? If so, how do I direct Virtualbox to the new location?

[mpack]

VirtualBox doesn't find files by magic: so naturally you can't move them after you told VBox where to look.

Look at the CD/DVD tab in File|Virtual Media Manager. Release and remove the iso.

[Lava]

Thanks, that worked to remove the ISO. But now that it's gone, how do I point it to the correct location? There is no "add" option on that tab.

[mpack]

Media is added to the VM that needs it, using the Storage panel of the VM's settings.