Everything was working fine with my Windows 7 setup until a Parallels update screwed up everything. After parallels updated itself (from the macOS side) I started my Windows 7 VM and then Parallels then began installing something within the Windows 7 environment (I think it's called Tools - it usually happens just after a Parallels update). Then I get this warning from Windows 7 saying that it cannot verify the software that Parallels/Tools was installing. I think I clicked "Ignore" (not sure). Then, the Windows Desktop was blank (usually the Win7 desktop is the same as my macOS desktop). Now I get this message every time I start Windows 7 Windows cannot access \\Mac\Home\Desktop I don't know what to do. Does Parallels have any support?