OK. Before we start, I've googled a f*** ton and non of the fixes work. I wanted to avoid asking here and end up looking lazy. motherboard:Asus B150M-A D3 SSD: Samsung EVO 840 120GB CPU: i5 6600 I recently upgraded from AMD to an intel CPU. When I tried to install windows 7 64 bit on my PC again, using a bootable USB drive, onto my previous SSD, it stopped me after pressing "install now". It said that "A required CD/DVD driver is missing, please ...blah blah blah." So after some googling, I tried backing out of the installation to where it says "install now", and pulling out the USB and placing it in another USB 2.0 slot. That didn't change anything at all. I can't change between AHCI and IDE because there literally isn't an option for it. I looked through every setting, and even called up ASUS, and they tried to direct me to something that didn't exist. I am running the latest BIOS version, after using EZ flash to do that. And the biggest issue is I can't use any program that required Administrator access because I'm on a library PC at my college. So basically I can't use any torrents either for the WIN 7 ISO. So basically I can't even install my OS because of this. Please Help!