I installed Mint 19.1 Cinnamon and it was working poorly. The USB port were not identifying flash drives. I tried lots and lots of things (really, lots of possibilities), but nothing worked. Then I installed Windows 7 to another partition, and then I did not get any boot menu and automatically Windows boot.
So i tried a lot more things (https://www.makeuseof.com/tag/fix-ubuntu-linux-pc-wont-boot/ and I can't boot to Ubuntu after installing Windows 7). The same linux live usb, another linux (Mint 19 XFCE), even live usb Windows 7 did not worked. I tried to Repair Windows boot (https://appuals.com/fix-non-system-disk-or-disk-error-message-on-startup/). Nothing... Only:
non-system disk or disk error replace and strike any key when ready [...]
I got desperate and deleted all linux partitions (root, swap and home) with windows disk manager. Tried the live USBs again and only windows is working (LINUXs are not).
I also tried EasyBCD to make a initialisation for the live USB linux. No success.
I don't what else I can do. I am hopeless. I would like to know: I a formatted everything with Windows 7 will I be able to install linux again?
Please help me.