Lotus Notes 8.5 requires the DCOM Server Process Launcher Service
I'm using Linux as my base operating system. Until Domino Designer is available on Linux I need to keep a Virtual Machine with XP around. I work with both VMWare and VirtualBox. One thing you automatically do with virtualized operating systems is to shut down what is not essential. In windows the services loaded by default can be cut back quite a bit. Of course you can overdo that. One lesson I learned the hard way: The Notes 8.5 client crashes fatally if the "DCOM Server Process Launcher" isn't running. Took me 2 days of wondering until Nathan gave me that tip. Apparently that service is needed on "bare-iron" windows too.