Chrome
Pros-Fast
Cons-No support, even with both of my windows xp machines
Firefox
Pros-Fast, secure,pluggins, portable version
cons- Slow start up speed, pluggins can still be malicious
Opera
Pros-Secure
Cons-I'm not sure I have not ever used it except for on my wii
Maxthon
Heard it's better than Firefox and Chrome
Safari
Pros- Somewhat fast
Cons- Not that good for downloading
Avant
I have only heard of it
Internet Explorer
Pros-Comes with windows, Give download destinations unlike firefox
Cons-Downloads even what you don't want, very slow, easily effected by spy ware
AOL
Went through enough trouble ending it.