Computer crisis

It's been terrible on what happen to my husbands laptop. They found 87 viruses on his laptop, geeeee!, I don't know how did it happen. I was the one using it. I feel bad about it though because I feel like it's my fault why it happen and now I have to be careful with the other computer because it might happen again. I just want it back because I miss my daily routine and I hope it will be fix this week.