ALYAK that free for personal use would be the best. Only problem is that this antivirus software is from Korea, but positive side is "Free." I have been using this and very pleased. I had 24 serious viruses and Tech tried to charge me $200's after he only removed 18 and wiped out a commercial software without telling me. I downloaded ALYAK and it found rest of those viruses and removed them wo any problem. I asked him why he removed the software and he argued back whether I had MS certified. Ha! I did not pay him a single penny. I strongly recommend you getting this.