I misplace my OEM original Windows 7 Pro DVD. I managed to get the download link from Microsoft but it contains Service Pack 1. Suddenly, even my old hard drive images are reporting invalid driver signatures which are I incompatible with the version supplied in the download. This is frustrating. Even my USB3 and ATI drivers are not being installed because they don't have a valid signature. My printer is experiencing the same problem. And yes. I'm disconnected from the internet while I install the drivers that I got from the manufacturer's website. I also noticed Windows Defender won't turn on. I've tried reinstalling Windows and using old hard drive images from 2018 but I still can't get past the signature bulls**t and can't turn on Windows Defender.