Within the span of one week, I have installed Dual Boot on my 2 laptops. Win 7 and Win 10 TP 64-bit Win 8.1 Pro and Win 10 TP 32-bit In BOTH cases, after install and before I started to install programs, I made a restore point, and then did a sfc. Both cases, sfc reported corrupt files but unable to repair. Both cases, dism/restorehealth repaired what sfc could not. Before dual boot install, my laptops were in healthy state. Corrupt files were found after dual boot install. Coincidence ? Wish someone else had done the same thing to confirm what I found.