I've been using Kaspersky for a few years, home and business. Never had any problem with it. It's good robust well written software.
Unlike the Norton/Symantec sh*t which messes up the machine and occassionally throws up compatibility issues with applications. Same comment for McAfee. These programs routinely come on cheap laptops in teh form of 30/90-day trial versions, and are a pig to remove; verging on impossible if you wait until the free period runs out.
Recently I have been using Avast and it seems to work. It's free, which is pretty good. I suppose they hope to make money on the upmarket versions.