5.1.0 extension pack install failure on Windows 10

[Retired_Gator]

???????==redacted for privacy reasons.

Successfully installed VirtualBox 5.1.0, however when attempting to install the 5.1.0 extension pack on Windows-10pro, extension pack installer fails with error shown below because the directory its trying to rename DOES NOT EXIST.

Failed to install the Extension Pack D:/??????/Downloads/Oracle_VM_VirtualBox_Extension_Pack-5.1.0-108711.vbox-extpack.

The installer failed with exit code 1: VBoxExtPackHelperApp.exe: error: Failed to rename the temporary directory to the final one: VERR_ACCESS_DENIED ('D:\Program Files\Oracle\VirtualBox\ExtensionPacks\Oracle_VM_VirtualBox_Extension_Pack-_-inst-4288' -> 'D:\Program Files\Oracle\VirtualBox\ExtensionPacks\Oracle_VM_VirtualBox_Extension_Pack')

rcExit=1.

Result Code: E_FAIL (0x80004005) Component: ExtPackManagerWrap Interface: IExtPackManager {edba9d10-45d8-b440-1712-46ac0c9bc4c5}

[Retired_Gator]

Damn McAfee bit me... turned off McAfee's "real time scanning" and tried installing extension pack again...and it worked!

Problem resolved.

[Frank Mehnert]

So probably nothing we can work around...

[ArifMustafa]

Same was happening with me, on Windows 8.1 x64 bit host machine,

installed virtual box version 5.2.2 r 119230 later after host restart, I tried to install the Oracle_VM_VirtualBox_Extension_Pack-5.2.2-119230,

got the below said failed to install error -

The installer failed with exit code 1: VBoxExtPackHelperApp.exe: error: Failed to rename the temporary directory to the final one: VERR_ACCESS_DENIED ('C:\Program Files\Oracle\VirtualBox\ExtensionPacks\Oracle_VM_VirtualBox_Extension_Pack-_-inst-4296' -> 'C:\Program Files\Oracle\VirtualBox\ExtensionPacks\Oracle_VM_VirtualBox_Extension_Pack') rcExit=1.

these all drama was happening due to the Internet Security, I stopped the antivirus for a moment, off the File System, Firewall, Application Manager & Control, Network Attack Blocker.

again tried to install the extension pack, and it installed just like that,

Well I feel to share the scenario, and it worked for me, thanks.

[BernieQ]

Do you have a solution for corporate PC owner? It's impossible to disable the anti-virus on mine, so I can't install the extension pack as I always have the VERR_ACCESS_DENIED error...

[Socratis]

Talk to your IT department. It's your antivirus that's blocking VirtualBox. There's nothing that VirtualBox can do about it. As opposed to your IT department...