It would also help if you would post the output from:
SELECT * FROM sys.configurations;
...and...
The current SQL Server error log
...and...
DBCC MEMORYUSAGE;
The output from the second and last ones will be large, so please post them in a zipped-up attachment.
Those pieces of information will answer many questions all at once.
Thank you
Paul
Paul White
SQLPerformance.com
SQLkiwi blog
@SQL_Kiwi