I have a multiboot system with Win 10, 8.1 and 7. My OS Drive was getting funky and I suspected was about to die, so I bought a new drive, cloned the original to the new drive (I had also backed up all drives using Acronis) . Boot up to the new drive problems, plug in the old drive, problems, restored the backup to the old drive using Acronis, problems. All three OS are showing but, I was getting a message "device not found" and then other messages. Go back to the new drive using built-in startup repair and safe mode and a ton of commands, finally got back into Windows10 and the 8.1. No such luck with Win7. Selecting that OS shows the windows splash screen and a second of the animation, then it reboots. On reboot I can get the safe mode/safe mode screen, but none of the options boot into safe mode, they all just reboot. I used the sfc /scannow command from within Win 10 (but on the Win7 partition) it stated it found errors and fixed them, I did this three consecutive times and got the same messsage, so I'm thinking its not really fixing anything. Tried to using the installation media repair was useless, Start up repair finds errors and supposedly fixes them (repeatedly), can't do a repair install (upgrade) because of I can't boot into Win7. Used ever tool I can find and nothing. 1. Is there any way to fix this, or can I manually rewrite/copy the files needed to boot. 2. Failing that is there any way to do a repair install of WIn7 from a disk? 3. and failing that how do you install Win7 alongside Win10 and after Win10 is in place. I know that in the past installing an older OS after newer OS was in place messed things up. Reading this http*://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/how-to-dual-boot-windows-7-or-windows-8-with/9ac7acc1-2152-4907-a9de-bd507273a57d makes it seem it is no big deal and won't cause any problems, is this accurate.