I've got a fresh out of the box PowerEdge T620 running Windows Server 2008 R2. There are two partitions, the C: drive with 39.9 GB and the D: drive with 793 GB. Windows is installed on C:. I haven't installed anything on the server.
Out of the 39.9 GB on the C: drive, only 2.62 GB is free. If I double click on C:, select all, and go to properties, it says the files only take up 16.5 GB. What else is using up space on the C: drive? The first thing I tried to do on this server was install .Net Framework 4.5.1, but it defaults to C: drive (which I don't think can be changed) and fails because there's not enough disk space.