Window 7 Freezing on Startup
Maybe there is a problem with your system RAM. Sometimes, when your memory is bad or when a memory slot on computer motherboard is bad, Window 7 freezing on startup could happen, but this is often rare.
Try changing your computer memory or reinstalling the computer memory. After that, restart the computer in Safe Mode. In Safe Mode, press Win + R keys to run MSCONFIG and press OK. Here please select the clean boot option by unchecking all the choices under Selective Startup. https://techtreme.com/windows-7-stuck-at-starting-windows