We are having some problems with our SQL Server installation. I've been trying to fix it all day but haven't really got anywhere. So apologies if you are experiencing anything weird or broken, we do know about it and are working on it now.
It seems to have started this morning and for no reason. Unhelpfully there are over 500,000 pages referencing the error on google, but the first few pages of them haven't yielded a solution yet!
So if we dip offline at any stage in the next 24 hours you'll know why...