I restored Mavericks using OS X Restore but Finder still does not work

Question

Mac Mini running Mavericks 10.9.5, 2.5 GHz, 4GB memory, etc
I can login remotely via ssh, so I can see that my files and applications are all there.
But the Finder shows an empty interface. No HDs, nothing in the Dock except Calendar,
which does not open, no files on the Desktop even tho' I know they are there.
"vi newfile" fails when I try to save using "w" or "w!":
Error message "out of memory (file system full??)", and only an empty file is created.
This is false as there is about 350 GB free on the hard drive.
"ps" typically says:
Finder: 165% cpu time
quickllookd 40%
xpcd 175% for first halfhour then very small, 1%.
======
peter% df
Filesystem    512-blocks      Used Available Capacity  iused     ifree %iused  Mounted on
/dev/disk0s2   975093952  96201248 878380704    10% 12089154 109797588   10%   /
devfs                370       370         0   100%      640         0  100%   /dev
/dev/disk1s2   976101344 478906144 497195200    50% 59863266  62149400   49%   /Volumes/Molika-Backups
map -hosts             0         0         0   100%        0         0  100%   /net
map auto_home          0         0         0   100%        0         0  100%   /home
======
*** How can I get a working Finder, and have a working mail Server ?? ***
Thanks,
--Peter R

Answer 1

iTunes: Missing folder or incorrect permissions may prevent authorization - http://support.apple.com/kb/TS1277 - Shared folder issues with Store authorization.
iTunes permissions re-set with Terminal after user deleted a directory used by iTunes - http://superuser.com/questions/80573/itunes-unable-to-authorize-and-unable-to-do wnload-media