FWIW - the size of your .mdf and .ldf doesn't coincide with the amounts of data they contain. You can have an .ldf that's 10GB that has no data...

I work 7.5 hours/day - for the state government.  I make less money than I did as a contractor, but you can beat the benefits and holidays. 

SELECT work FROM All_Jobs...

Look in your application and system log to see if your server is having problems talking to the domain controller.  This is probably an issue with active directory.