Rachmat Febrianto

Borobudur Temple, West Java - Indonesia : http://en.wikipedia.org/wiki/Borobudur

After uninstalling my VirtualBox, later after that I Re-Install it again. When I wanto uninstall the Extension Pack I got following error :

Failed to uninstall the Extension Pack Oracle VM VirtualBox Extension Pack.

The installer failed with exit code 1: VBoxExtPackHelperApp.exe: error: Failed to rename the extension pack directory: VERR_ALREADY_EXISTS

rcExit=1.

Result Code: E_FAIL (0x80004005)
Component: ExtPackManager
Interface: IExtPackManager {3295e6ce-b051-47b2-9514-2c588bfe7554}

After googlig, I got solution to fix it.. you just have to clean the extension pack with the command line:

C:\Program Files\Oracle\VirtualBox>vboxmanage extpack cleanup
Successfully performed extension pack cleanup

C:\Program Files\Oracle\VirtualBox>

Try to re-install extension pack, and it installed successfully.

refer to vbox forum : https://forums.virtualbox.org/viewtopic.php?f=2&t=41077