Computer shuts down while using malware bytes!

[blahblah123]

Okay so I do what I normally do, I do a full system scan on my cpu using MalwareBytes, and I find one infected file, (Combat Arms specifically) and I was in the middle of removing it then all of a sudden my Computer shuts down by itself!!!! Is it infected all over again!!!!!! I was just removing the file!!!!!! What's going on? I unplugged the internet cable immediately after this. Please tell me what to do, and what's going on!