Hi, I'm experiencing the same problem and have followed instructions from both of your posts but keep getting this message after reinstalling Parallels Tools:
Windows cannot access \\psf\Home\Desktop
Check the spelling of the name. Otherwise, there might be a problem with your network. To try to identify and resolve network problems, click Diagnose.
When I click "diagnose," I get a message that says "Problems found One or more network protocols are missing on this computer" with no other options but to close the Windows Network Diagnostics.
I have the new Windows 10 Insider Preview and Parallels Desktop 10.2.1 installed on my Yosemite