Your max memory is set way too high. I would drop that down to a more reasonable value.
As Frederico_fonseca said, you should have at LEAST 1 GB free for the OS and more depending on various thing. For example, if you run SSRS, SSIS, SSAS, antivirus, IIS, basically any other tools, you need to leave some memory for each additional thing you have installed. Giving SQL default memory (2 PB) means SQL is going to eventually use up ALL of those 32 GB that you have leaving near 0 for any other processes.
My preference is to have 4 GB for the OS and antivirus, and more for SSIS, SSRS and SSAS. Then I do not install any other software on there (no IIS, no SSMS, no visual studio, no chrome browser, etc). When I say "more", how much depends on which of those you have installed and how complex the packages/reports are. More complex usually means more memory.