Free av for netbook?

Hi all, I've been reading & search through this forum a lot prior to this post. After choices & trials, I need to clarify & need of advice on what I found:

FREE Standalone: Avast free, Panda Cloud, Kingsoft AV, MSE.
Free suites (include obtainable paid products through company & university for free): ZoneAlarm AV+FW, Comodo AV+FW, Roboscan IS, Outpost Suite, Sophos, McAfee Enterprise, Trend Micro Titanium IS.

In your opinion, for netbooks, old CPUs, low GPU specs.
Windows XP, 1GB - 2GB RAM, which should I use for standalone AV or suite?
Windows 7, 1GB - 3GB RAM, which should be the choice for AV or suite?

I'm not looking for something to protect the machine from all virus but get heat up and burn the netbooks.

Appreciated your opinion if any. Thanks,
GH.

 

I'd just throw MSE out from the list of choices as its slow as snail and with on-access archive scanning creates unnecessary overhead and battery drain.
All the others are ok.

 

All good on the list. All AV struggle to some extent with archive files so disable it from real time scan if you notice any delay. Take a pick and come back if you have specific question about your chosen security solution.