Yesterday, when i booted into my windows 7 64bit installation it took me to a black screen with a cursor and nothing else.
What happened was i was trying to tweak the 'authui.dll' (i wanted to remove the logon picture...never do that again) and i changed a height and a width value. At reboot it took me to the black screen.
I booted into another windows install and changed back the files and restored every permission and ownership manually.
Then my original windows install (instead of booting normally this time) didn't manage to start. I have 'no gui boot'
enabled. Instead of giving me 8 or so little blue lines on the top, it gives me the lines and a Bunch of other colorful dots horizontally. The colored dots change slowly and nothing happens.
In safe mode i see the same dots but Over the DLL loading screen.
I created a bootable usb drive that has the official windows installer on it and it is the same version as i use.
The installer console detects my original istallation, but i can't run sfc /scannow at all. (gives me the same error every time, screenshot below)
I also tried 'Upgrade'-ing but i could only do that if i were running the original installation. Any help would be greatly appreciated. If i can't fix this installation in like 2 days i'm screwed