Right now we have server related questions on Server Fault, home user related questions on Super User and Stack Overflow for programming related questions. There seems to be a gap for admin related questions, e.g. how to fix a desktop that won't boot, how to deal with bluescreens and other desktop related questions. Currently many of these types of questions get dumped from Server Fault to Super User. Right now there is no "stackoverflow" for admins
There is a gray area where the two overlap, and unfortunately I've seen single-machine admin questions get closed or moved from ServerFault. Having said that I don't think we need another site, we just need people to exercise good judgment when making a decision on the questions.
Superuser is the right place for the questions that you have given as examples.
They get dumped on SU if they are personal / individual problems. SF if it's a large scale business problem. "My Windows 7 computer won't start up after opening an
I love you email" vs. "My web server went down and it's hosting 20 sites, I have a whole bunch of Apache mod_`s running"
Right now we have server related questions on Server Fault [..] Right now there is no "stackoverflow" [sic] for admins
Odd. The Server Fault FAQ states (emphasis mine):
Server Fault is for system administrators and IT professionals, people who manage or maintain computers in a professional capacity. If you are in charge of ...
- many desktop PCs (other than your own)
... then you're in the right place to ask your question!