To prevent the spread of computer viruses and worms, ITS recommends that you install and maintain antivirus software. ITS offers free downloads of Avast Premier Crack for Windows (Vista/7/8/10) This virus protection program is a well-respected antivirus suite with some highly rated protection. ... The suite is very well organized, easy to understand, and comes with a good number of extra features. It's really expensive, however, at $70 just to cover a single PC.