Cant install panda antivirus?

I installed a norman or norton antivirus demo or i didnt rly install it i did something strange like didnt activated it with the cdkey just installed or sumthin, and then i couldnt install panda antivirus because that norman/norton demo was alrdy installed so i tryed to uninstall it but there wasnt any uninstall on for it so then i started it up in safe mode and deleted everything taht had with norman/norton to do with but i can stilll not install panda antivirus because it say that i alrdy have a antvirus installed :�[ plz help me!, Love Tom