Using Virtual Machine on muliple OSs

[townsbg]

I have Windows 7 and 10 both installed and I'm trying to run some of the VMs on 10 with the latest version. I'm getting the error.

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Result Code:
VBOX_E_OBJECT_IN_USE (0x80bb000c)

How do I get around that? I copied the config file to 10 and changed the location to the path of vdi. With another VM I was testing a copy of I removed the VDI file from 7 then copied the config file and added the VDI file back on both OSs. However in this case I have the VM encrypted so I'm afraid to do that. When I encrypted my test using 10 I had to copy that config file to 7 and change the path in the config file. My question is why doesn''t copying the config file to 10 work? Why is there that restriction and how do I get around it? I don't need it checking if I have it mounted in another OS because clearly I can only use it on one OS at a time, I don't have snapshots, and I don't have the state saved. There should be no reason why I can't do this.

[carsonedwards]

Use VirtualBox's VBoxManage to unregister and re-register:
On the source machine:

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VBoxManage unregistervm "VM Name" --delete

Move the VM folder (including disk images and configs) to the new host.
On the target machine:

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VBoxManage registervm "Path\to\your.vbox"

[townsbg]

Thank you for your reply however I want to know how to share the virtual machine not move it from one to another.