title: Can't log in to SQL Server 2008 Management Studio
body: <p>I think something happened to an mdf file on disk.<br>
  When I try to start SQL Server Mgmt Studio (SQL Server 2008, Win 7 x64), I get an error:<br>
  "Cannot open user default database."<br>
  Since I can't connect at all, how do I fix this?<br>
  I have tried connecting to other dbs using osql, but always get an error.</p>
  
  <p>Thanks for any workarounds...</p>