TLDR; VBoxHardening.log is attached. The last line of it is:
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248.1cec: supR3HardNtChildWaitFor[1]: Quitting: ExitCode=0x40000015 (rcNtWait=0x0, rcNt1=0x0, rcNt2=0x103, rcNt3=0x103, 2969 ms, the end);
I have not updated Win7 on PC or laptop, so just in case here is a list of recently updated software from Control Panel -> Uninstall a program (sorted by install date) from my laptop, which I use right now:
Microsoft Edge WebView2 Runtime (version 107.0.1218.62, installed on 2022-12-01, I presume Chrome installed this )
Google Chrome (version 107.0.5304.123, installed on 2022-12-01)
Oracle VM VirtualBox 7.0.4 (version 7.0.4, installed on 2022-11-30)
Telegram Desktop (version 4.3.3, installed on 2022-11-26)
I haven't tried to uninstall Chrome (it's kind of a headache to tie all my Google accounts back) or Telegram (for no particular reason ), but I do remember uninstalling WebView on my PC and it didn't help (rebooted host after removing). Neither helped reinstalling VBox.
I threw many threatening glances at the log-file, but no secrets were revealed (my VBox-Log-interrogation skills suck ). Hopefully someone with a great level of VBox-Log-reading-power could help me .
Thank you.
Update:
Forgot to show the message from VBox while starting VM:
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VirtualBox - Error In supR3HardenedWinReSpawn
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<html><b>Error relaunching VirtualBox VM process: 5<br>Command line: '60eaff78-4bdd-042d-2e72-669728efd737-suplib-3rdchild --comment VM_01 --startvm 3cab6bb2-cd26-4aed-b67b-0e2e19243719 --no-startvm-errormsgbox --sup-hardening-log=D:\vms\VM_01\Logs\VBoxHardening.log' (rc=-104)</b><br/><br/>Please try reinstalling VirtualBox.<br><br><!--EOM-->where: supR3HardenedWinReSpawn
what: 5
VERR_INVALID_NAME (-104) - Invalid (malformed) file/path name.
</html>
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OK
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VM Name: VM_01
The virtual machine 'VM_01' has terminated unexpectedly during startup with exit code 1073741845 (0x40000015). More details may be available in 'D:\vms\VM_01\Logs\VBoxHardening.log'.
Result Code:
E_FAIL (0X80004005)
Component:
MachineWrap
Interface:
IMachine {300763af-5d6b-46e6-aa96-273eac15538a}
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C:\Program Files\Oracle\VirtualBox>VirtualBoxVM --startvm "VM_01"
C:\Program Files\Oracle\VirtualBox>