One of my machines keeps producing errors starting the virtual machine. https://uspex-at-home.ru/prediction/show_host_detail.php?hostid=141.
It is running with virtualbox 6.1.34 on Win 7 and running the 4GB tasks. CPU has hardware virtualization support and it is enabled.
I have another computer which is running with virtualbox 6.1.34 on Win 10 and running the 6GB tasks and is working fine..

I am unsure if the windows version makes a difference, if not then I cant find what would be causing the error.
In the Stderr output I find "More details may be available in 'C:\ProgramData\BOINC\slots\2\USPEX_VMVASP_52769183\Logs\VBoxHardening.log'" this however doesn't help much as the slot is over written by new tasks.