Rit_86 :
Go for 360 total security. I was blown away by it.
I have tried Avira, Avast, AVG, Panda, CIS, Zonealarm, Ad aware etc. Nothing comes close to this in terms of lightness. Has one of the best detection rates in industry too.
Then don't read this users review:
"Qihoo is one of the most dishonest companies that exist" August 20, 2014 | By Michaellee95 | Version: 360 Total Security 4.0.0.2065
Pros
millions of users had their personal documents stolen by the company and published on the Internet.
Cons
Qihoo is one of the most dishonest companies that exist
Qihoo caused a great panic in China, millions of users had their personal documents stolen by the company and published on the Internet.
Summary
Qihoo is one of the companies already committed more absurd practices and a collection of data theft scandals, eg "PSafe" a base of Qihoo in Brazil
has several fake Facebook profiles to promote themselves, stealing identities of people who have absolutely no relationship with the Company, at the same time trying to denigrate the image of competitors.
Qihoo also had the most banned from app store after creating a fake Windows update and infect much of the users applications in China.
application stores excluded: all software of Qihoo after she create a fake Windows update to install your software.
http
/seekingalpha.com/instablog/582827-matt-berry/921811-qihoo-the-security-software-company-accused-of-leaking-users-private-information
http

/www.techinasia.com/360-safe-browser-malware/
http
/www.businessinsider.com/citron-still-working-on-qihoo-fraud-story-2012-2
http
/seekingalpha.com/article/807811-qihoo-360-fakes-a-microsoft-security-patch
http
/seekingalpha.com/instablog/582827-matt-berry/722711-qihoos-backdoor-suspicions-erupt-in-user-backlash
http
/seekingalpha.com/instablog/582827-matt-berry/921811-qihoo-the-security-software-company-accused-of-leaking-users-private-information
Nah seems legit...