I have not used antivirus's on my main computer for years. They are bloatware and and the resident ones scan everything as you work on each file and the overhead is ridiculous in addition to annoying live updates.
The fine line between viruses and spyware is almost gone, it's all malware and many spyware scanners will do fine for a sweep every now and then. Just make sure you immunize your system with Spybot, have teatimer to monitor registry changes, and then get fixes for any possible exploits and you should be clear to go. I've never had a virus in about 5 years. So glad I ditched Norton, Mcaffee, AVG, Kapersky, Bitdefender, etc.
If a major issue comes up, I run combofix.exe
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