I ran Malwarebytes anti malware on my laptop and it worked a treat, so did the same to my mums laptop.
Hers however came up with over 1000 infected files and i stupidly just clicked fix, then when that had finished i clicked restart as a reboot was required to complete the process.
I didnt save the log that came up so dont think I will be able to tell you what i deleted, unless there is some way of recovering this.
Anyway, when i turn it on all i get is a black screen, i can run it in safe mode but does the same.
I have no idea about dos and need some help to get this back up and running.