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Disable your CAPSLOCK at the left of your keyboard.
For your pb, try to remove the line sqlnet.authentication_services=(NTS) from the ORACLE_HOME\network\admin\sqlnet.ora file on the client and server or set sqlnet.authentication_services=(NONE).
Verify if you have all the rigths on Oracle files.
this is generally a RAM issue...
again restart the computer, now go to the services section stop
some of the services that you don't need then make them manual,
now go to the property section of oracle services and make it manual too,
restart your computer...
go to the dos prompt and type this:
c:> set oracle_sid=<SID>
c:> oradim -startup -sid <SID>
where <SID> is the name of your service
this will start your service....
Did you see any ora- errors in alert log?
As you told it is a RAM issue, does it happen, if the RAM is consumed a lot and it throws the error.
It gives me this error and still the service 'starts'. I do not get this error in the first database I open in services, which makes me think, that the RAM/memory which you pointed might be correct.