An attempt to start the Enterprise Vault Admin Service after restarting the server, or after restarting all Enterprise Vault Services, will fail with the following error:
Could not start the Enterprise Vault Admin Service on Local Computer. Error 1053: The service did not respond to the start or control request in a timely fashion.

Error registering file: C:\Program Files (x86)\Enterprise Vault\AdminService.exeAttempting to start the Admin Service after closing the pop-up above returns the error:
Could not start the Enterprise Vault Admin Service on Local Computer. Error 1053: The service did not respond to the start or control request in a timely fashion.
Warning: Incorrect use of the Windows registry editor may prevent the operating system from functioning properly. Great care should be taken when making changes to a Windows registry. Registry modifications should only be carried-out by persons experienced in the use of the registry editor application. It is recommended that a complete backup of the registry and workstation be made prior to making any registry changes.
Certain 3rd-party programs utilize a series of registry keys to allow an arbitrary list of DLLs to be loaded into each user mode process on the system. This list of DLLs is loaded every time the DLL_PROCESS_ATTACH process of User32.dll is used, and there are very few executables that do not link with User32.dll. The Enterprise Vault executable AdminService.exe does utilize User32.dll.