On PC, changed resolution to Portrait mode, now big issue

Hello, I was messing around with my screen resolution settings when I switch over to portrait mode on desktop PC. When I hit apply the screen started flashing and it went to protrait. I saw thye option to revery back but with they screen flashing I couldn't hit it. Then the settings set in and the screen went back to the sigin in menu in portrait.

I can enter my password, sign in, and then it tries to load the start menu but the screen starts flashing and after about 8 seconds, it goes back to the sign in menu. Now I am stuck in this process and cant get back past the sign in screen to access the control panel and set the screen back to landscape. I don't know where to go from here, restarting the computer doesn't help.

Ok I got so frustrated I found an old Vista disc and installed it. After installation I was taken to a menu that let me boot windows 8 in safe mode (why they made this so difficult to pull off on a restart is beyond me). IN safe mode everything works fine I went to display and selected landscape and all of that again but when I go back to normal mode its still in portrait. Windows simply will not function in that mode for me beyond the sign in menu. I have no idea how to get past this.