Doubtful the cause of your pain, but.... the SQl Server Max Memory is set at the Default, out of the box value. This is usually bad - SQL will usually consume all memory it is allowed (as it should for performance), unfortunately the default of over 2Billion megabytes is more that most people will actually have in their server, so the server OS struggles to run.
You might want to see about reducing that to leave at least 4GB free, so 20480MB and 61440MB respectively for your 24 and 64GB memory servers.
Actually, if you have Office and all sorts of other stuff on there needing memory......
"Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it. When we enquire into any subject, the first thing we have to do is to know what books have treated of it. This leads us to look at catalogues, and at the backs of books in libraries."
— Samuel Johnson
I wonder, would the great Samuel Johnson have replaced that with "GIYF" now?