One of my favorite channels on Youtube is Britec09. He has numerous videos detailing how to remove malware from computers even some of the tough to remove ransom-ware. Just a great resource for those in the technology field or home users. Also has videos related to booting in to safe mode on various platforms, dual booting, and even fixes for the forgotten password. So check them out: Britec09 on Youtube
How to Boot into Safe Mode On Windows 8