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#11
On my Primary box I have each OS on a separate drive.
I did the free Win 10 upgrade from Win 7 x86, then did a clean install of Win 10 x64.
My test box is a triple boot with all OS's on the same drive.
I haven't upgraded to Win 10 on the test box yet.
If it causes me problems having all OS's on the same drive, i'll split out W10 and put it on a separate drive.
That's a good point.
If the OP is running an upgrade install, a clean install might fix the problem.