Hello, welcome, sorry to hear you are having problems, hopefully we can get you fixed up.
The 470 is the first gen of the mediasmart line, so they are getting pretty old. But there are still many out there doing a great job with a little cleaning now and then.
To answer our ram question, all of the mediasmart servers could go up to 4 gig ram, but it needs to be the older style ram, the newer hi-density stuff will not work.
Also, the cpu can be upgraded while your in there, I have done both and can tell you it makes the system run a lot smoother/faster.
You should be able to search the 470 thread for ram and cpu types.
Question, do you have the FREE Smart addin installed and if so are all your drives ok? If not, Smart is a must have, it will tell you a drive is having problems long before the server will.
http://www.dojonorthsoftware.net/dl/InstallHomeServerSMARTClassic.zipAs for your system, sounds like the OS needs to be refreshed.
IF it were me and I was going to keep the system for awhile, I would get a good backup of all your data onto another pc or and external drive/s then I would purchase 2-3 2tb red drives and start over.
But before I reloaded, I would test the new ram, make sure it boots up with it and then try the new cpu, make sure it boots up with it as well. Then you know you are good to go with a fresh OS and copy the data back.
While your in their, a can of air to blast out the dust bunnies, power supply fans, case fans, and everywhere inside.
I know a reload is kind of (maybe overkill) but I have been working with windows, before windows
and I know that sometimes the best thing you can do is just nuke it and start over, fresh.
Let us know how it's going or if you have any other questions.
P.S. The one user being locked out use to happen to me every now and then.
You need to get into the server, control panel, administrative tools, computer management, local users and groups, users and look for the user that is locked out. Right click on the user and click properties, you will most likely see (user is disabled) checked, just uncheck it, reboot the server and you should be good to go.
Why does that happen, I have no idea except to say (it's windows) I have had to do this 3-4 times in 9-10 years.
Good Luck and enjoy...
_________________
[X510 CPU/RAM/
All 2 TB Red's] [X510 CPU/Sync'ed Backup/All 2 TB Hitachi's]
[X510 /2 in box]
[X710 LIAN LI DIY W2016E] Stablebit Drivepool [EX-503 LIAN LI 5-bay USB3 External]
Fear the Cloud