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I haven't seen the error 0x02 yet, but the other errors are normal.
They appear because some of the registers are read-only.
But in this case we only needed the setup-register and that was applied successfully, so that's fine.
If VirtualBox shows that AMD-V is enabled and you can use it properly, then I wouldn't worry about what the task manager shows.
If you want, you can do some more reboots and look if the task manager shows virtualization as disabled after any of them.
In case it does show virtualization as disabled again, dump the variables with H2OUVE to a new vars-file (vars2.txt) and upload it so I can take a look at it. You can use this command:
H2OUVE.exe -gv vars2.txt
In case you restore to default settings in the BIOS, you will probably have to apply the modded vars file again, but otherwise AMD-V should stay enabled.