In answer to some of the above questions -
Kovid uses an API (application programming interface) called WMI. This provides an operating system interface with windows hardware, among many other things.
Per Kovid - "There are no plans to use anything other than WMI"
https://www.mobileread.com/forums/sho...d.php?p=711786
Windows 7 Profesional has no problems in itself with Calibre, but acording to Kovid the WMI susbsytem (or some of its' files) can become corupt. Acording to "WMI Control" in Administrative Tools, WMI is working correctly. But not according to Calibre.
With Calibre having trouble with WMI on 2 of my computers it will not find the PRS-600.
I have searched the net and the Microsoft Knowledge Base. None of the solutions have helped. Kovid sugested that the only way he knows to fix it is to re-install Windows. My Win 7 system is going on 3 months and I just don't feel like doing that.
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So lets start again.
I am not complaining about any version of Windows.
I am not complaining about Calibre.
I AM seeking comments from other ereader users about thier readers in a search for a better reader/software SYSTEM. They do not have to know EVERY system out there to tell me what is the best one, just tell me if you like the way that yours handles ebooks.