While on the internet, a screen popped up on my daughters computer saying that her computer had all these viruses. I'm not sure what she did, but now she has a problem. I went to her house and ran Malwarebytes, Superantispyware and Hijackthis. Then I installed Avira and ran a scan. I got rid of a lot of junk but I'm not sure all is well. In Hijackthis it shows about 60 Host files that I can't get rid of. It says something to the effect that they can't be written to. Could there be a root kit?