Windows Defender Offline Beta, is an application you can add to USB, CD, DVD to allow you to boot to the USB, Disk and see if the application can remove any malware that is causing your PC not to start. While this is a beta and beta’s are programs in development its a great option to the fight against malware for any PC tech.
“Sometimes, malicious and other potentially unwanted software, including rootkits, try to install themselves on your PC. This can happen when you connect to the Internet or install some programs from a CD, DVD, or other media. Once on your PC, this software might run immediately, or it might run at unexpected times.Windows Defender Offline Beta can help remove such hard to find malicious and potentially unwanted programs using definitions that recognize threats”