Free antivirus?

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I had Avast!, and I was very happy with it. Then it became bloatware, with loads of huge services that I didn't want, and took memory even if disabled. I got so tired of it, that I went for a looong search. Basically my only option, of the many I found and inspected with magnifying glass, was Avira. So...

I had Avira, and I was very happy with it. Now in a matter of 2 months, has became bloatware too, installing without any warning several large and unwanted services that I don't want. One took 0.5Gb of memory for doing nothing (since I'm not a premium user). Thankfully, some these services are independent of the main product and could be uninstalled independently. But they messed up my startup programs (including not showing Avira's own icon on system tray) and left Avira and parts of my system in poor condition. Besides that, some stuff still lies there, and pops up from time to time, and I can't seem to disable it (the configuration options for this new stuff is, literally: english or german). So I want to say bye bye to Avira.

Bitterness ended, I'm looking for a new antivirus for my new system reinstall. It must be free, because I can't pay a monthly or yearly fee now (and probably in a long time). I'd prefer that it doesn't include "game booster", "system cleaner", "start-up beautificator" and other bloatware. I want a simple, free antivirus. I don't need ghost VPN, nor email checking. Just realtime protection, an scan from time to time, something simple and with decent scores on antivirus comparisons. And I'm not considering Panda even if they would pay me to use their product. Oh and I'm staying with Windows 7 for a few years more before going back to Linux.

If I don't find anything decent, I'll have to reinstall Avira, but I can't trust it as much as I've been doing for quite long. So I'm open and thankful for any suggestions.