I am running a multiboot W7-pro and W10-pro with several harddisks build in the computer to discover that after W10 used a disk W7 wants to check it to find no errors. Beside that I am not allowed to delete some folders I created in W7 after using them in W10 and they are set to free for use for everybody. W7 now askes me to get permission from that everybody. I think they mean the W10-everybody. Understand that security is important nowadays but this is becoming a disaster!
Also discovered that running the backupapplication Cobian (that always did a perfect job in W7) now is not allowd to acces lots of files in W7 anymore after W10 did ?????something??????. Another example: I have two SATA backup 1 Tb Disks I switch every few weeks. W10 refused to see the new one after the first switch. Had to go deep into settings to carefully trying to open its content again as W10 told me zero bytes were used. In the end the 900 Gb data was there again but I have forgotten all the steps needed to fix it.
My best guess is that beside Microsoft is messing around with accounts and rights to get full control of your computer. They do not want you to be in control yourself anymore and you have to (must) only use W10 in the future.
I am starting to feel a big fool that upgraded to W10 as I am loosing control over my PC's and home-network day by day!!!!