HP Protect DLL unsigned? (virtualbox hardening issue)

[krthie]

I had installed VirtualBox which was working fine. Then installed HP security tools. VBox now refuses to start with the following message in its VBoxHardening.log

2160.4ab4: supR3HardenedScreenImage/LdrLoadDll: cache hit (Unknown Status -23021 (0xffffa613)) on \Device\HarddiskVolume3\Program Files\HP\HP ProtectTools Security Manager\Bin\DpOFeedb.dll [lacks WinVerifyTrust]

2160.4ab4: supR3HardenedScreenImage/LdrLoadDll: cache hit (Unknown Status -23021 (0xffffa613)) on \Device\HarddiskVolume3\Program Files\HP\HP ProtectTools Security Manager\Bin\DpOFeedb.dll [lacks WinVerifyTrust]

2160.4ab4: Error (rc=0):

2160.4ab4: supR3HardenedScreenImage/LdrLoadDll: cached rc=Unknown Status -23021 (0xffffa613) fImage=1 fProtect=0x0 fAccess=0x0 cHits=128 \Device\HarddiskVolume3\Program Files\HP\HP ProtectTools Security Manager\Bin\DpOFeedb.dll

2160.4ab4: Error (rc=0):

2160.4ab4: supR3HardenedMonitor_LdrLoadDll: rejecting 'C:\Program Files\HP\HP ProtectTools Security Manager\Bin\DpoFeedb.dll' (C:\Program Files\HP\HP ProtectTools Security Manager\Bin\DpoFeedb.dll): rcNt=0xc0000190

2160.4ab4: supR3HardenedMonitor_LdrLoadDll: returns rcNt=0xc0000190 'C:\Program Files\HP\HP ProtectTools Security Manager\Bin\DpoFeedb.dll'

2160.4ab4: supR3HardenedScreenImage/LdrLoadDll: cache hit (Unknown Status -23021 (0xffffa613)) on \Device\HarddiskVolume3\Program Files\HP\HP ProtectTools Security Manager\Bin\DpOFeedb.dll [lacks WinVerifyTrust]

t]

More info on the hardening process is at  https://forums.virtualbox.org/viewtopic.php?f=25&t=82106. It seems to imply VBox thinks that this DLL isn't signed properly. This would be quite weird for a security tool of course.

I probably will need to remove the HP ProtectTools, but that doesn't seem to be trivial (and is also a pity). Anyone knows more about this?