Lil'Wayne

can bitdefender total security 2012 find all keyloggers?

i bought bitdefender total security 2012…can it find all keyloggers? cause i seem to have problems with my mail (someone keeps guessing my password)…i didn t download absolutely nothing from the net nor did i open any mail….i use my computer only to check my mail once 3 months as to not deactivate my mail…the computer is absolutely new
i used to have a password formed only of lettercase letters and 1 digit… now i have one formed of symbols and letters
please help thanks