This error is related to tempdb, SQL Server is not able to allocate space to tempdb.

Do you know where your tempdb resides, if yes check the drive and free up some space.

else if you don't know this then:

At command prompt in C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn run

sqlservr.exe -c -m -T3608

then open another command prompt run

sqlcmd -A

ALTER DATABASE tempdb

MODIFY FILE (NAME = tempdev, FILENAME = '{new location}\tempdb.mdf');

ALTER DATABASE tempdb

MODIFY FILE (NAME = templog, FILENAME = '{new location}\templog.ldf');

Now stop the cmd shell by ctrl + c

then shutdown the server and start it again in normal way.

If it work then just say thanks. Will wait for your response.