It is best to run different types of protection, always running anti-virus program and anti-spy/mal/ad-ware programs as needed.
Use a Good Antivirus Program
Install update and run often, a good anti-virus program such as Avast or Avira. This is based on independent testing from AV Comparatives. As for paid anti-virus I prefer Trend Micro's Worry-Free Business Security Services.
Every month or so run an online antivirus scan like Trend Micro's Housecall.
Once a year download and reinstall all of the anti-virus products you use.
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