Try MalwareBytes' Anti-malware (MBAM)
It doesn't offer live protection with the free version.
AVG is bloated, like Norton
ESET NOD32 is GREAT, but takes time to get used to, and sometimes may cause system errors upon uninstallation.
Avira is NOT too old! The older, the more experience! If you're talking update-wise, no way! It updates every single day.
I recommend Avira. You can get the free version, or just try the full suite. Go here for a FREE AND LEGAL license. It is a PROMO, not WAREZ, hosted by the AVIRA DEVELOPERS.
https://license.avira.com/en/promotion-hylm9fbv7chaxs8zbl83?If you don't want the full suite (for example, firewalls are hard to configure. When I had the suite installed, I had to add SA:MP as an exception to the connection list...), try this:
https://license.avira.com/en/promotion-t0q1aatr05zwftftgnqrDUTCH:
https://license.avira.com/de/promotion-a8ydzq3fgnsu051rwq81