i have tried nod32, mse, mcaffee and bitdefender. the one i think that does the best work is bitdefender. It does slow your computer sometimes but i think it is worth it for the protection it gives. I head good stuff about g data. I might try that out when i have time. But for now, bitdefender has my vote. You can get some feedback on bitdefender at http://www.hopreviews.com/reviews/bitdefender-internet-security-2013/ if you need it.