Best Anti Virus Win8?

Hey guys been running into some issues on my win8 upgraded desktop...thinking it relates to my email sending out spam and debit card getting hacked. Have always ran AVG, loaded the latest version of that...but win kept telling me that it wasnt on. Tried to uninstall and it wouldnt let me...had to use one of their uninstaller programs which looked like it worked. Anyways, wondered what you guys are running over there and if you had any tips with keyloggers etc. I know I should reload win8, but its tougher since I upgraded from Win7. Thanks for any tips