First of all, sorry for being massively noob in this matter (AND being a french person). Here is my situation :
I had a dual boot with Win 7 (main partition) and Ubuntu. After several years, I decided to get rid of Ubuntu and restore the whole system. I don't own any installation CD so I switched to the constructor config (Win 7 Home Premium). Once the operation has ended, I rebooted my computer and - Ô - misery, I got the <grub rescue error message.
After some research I found SGD and tried to boot it on a usb device thanks to Unetbootin. Problem : nothing boots at all and I end up with "BOOT PROBLEM" on the screen. (The boot priority in the BIOS is ok and I tried it with a different usb flash drive).
What could this come from and what to do ?
Many thanks !