Completely failed to instantiate CLSID_VirtualBox: RPC_S_SERVER_UNAVAILABLE

[Lefej]

Hello!
I cant launch VirtualBox. It shows error:

Completely failed to instantiate CLSID_VirtualBox: RPC_S_SERVER_UNAVAILABLE
Error code:
CO_E_SERVER_EXEC_FAILURE (0x80080005)
Component:
VirtualBoxClientWrap
Interface:
IVirtualBoxClient {d2937a8e-cb8d-4382-90ba-b7da78a74573}

Could anybody help me please?

[scottgus1]

Apparently Virtualbox did not get installed correctly. Uninstall it, reboot, then right-click the installer and Run As Administrator, even if you already are an administrator. Don't skip the right-click-RaA.

Also see viewtopic.php?f=6&t=80960 (found by googling "Completely failed to instantiate CLSID_VirtualBox: RPC_S_SERVER_UNAVAILABLE")