Avast Professional Edition
A newer version of Avast Professional Edition is available.
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Full user review
"The best antivirus program and the best support."
I don't know of another security company that updates their definitions on a daily basis. It simply works and keeps you safe. I have been using it for over 2 years now and have not had one infection even though I had an infection that Avast was able to find that my old software had allowed in. I have not ever had a problem with the program but have been told by friends that I reccomended it to that have and they have each and every one told me how impressed they were with the speed and helpfulness of support.
I haven't found anything to dislike about this first rate product.