go for ESET smart security 32 an 64 bit. never gave any headache and problems the moment i have installed it. light on resources. update is on breeze. i was on norton Int. security 2011. (geniune). i consumed my HD access so much. slowed down my lappy (corei7, 6gb ddr3 1377mhz RAM, 650gb). though while was on norton pc din lagged down. just ran fine until i realised it could run much faster. ESET keeps scanning in background all the time so not a single virus encountered. while keepin it very low on resources. just encountered trojans and malware. its fantastic. since then it never occopied my hd heavy access. dont trust avast (as eveyone says its fast. yes it is but it do compromise on your system data security as it do not catch malwares and trojans properly.only thing for eset is you awalys have to have a user and password to get updated. rest is good to go.u can get nodlogin app. which find a key itself or can go to serveral nod32key blogs and get one.chao!!