I tried the AVG linkscanner a while back and it seemed very good until one day when the AVG servers were down. My browsing slowed to a crawl and was almost impossible to do. I dumped it immediately.
Avatar FX6327X Desktop, AMD FX-6300 6 core CPU, Radeon R9-270X graphics, 8GB RAM, Windows 8.1 64 bit, Bitdefender Free antivirus, MBAM on demand
HP6140 Laptop, AMD A8-3500M Quad Core APU, 6GB RAM, Windows 7 Home Premium 64 SP1, Bitdefender Free, MBAM
Google/Asus Nexus 7 tablet, Qualcomm Snapdragon quad core 1.5ghz, 32GB storage, Android 4.4.4, Dolphin browser, TrustGo Mobile Security All machines behind a NAT router