What virus software works best with QuickBooks Pro
anyone know anything about Avast software
anyone know anything about Avast software

Yes, I have used it for the past 4 years with Pro and Premier without any problems.
Will
what avast program do you use? are you using it because you process credit cards?
thank you
I use the Pro version for my business and the free version on the home computers. I do not process Credit Cards.
Will

My computer tech says Norton is the best
If you're using a recent edition of QB, Norton/Smanetec should be fine, thought you may need to delve in to the firewall settings from time to time. Ditto McAffee. For people on older versions, especially circa 2006 editions, QB may fail to run at all if Norton/MA are even installed.