multiple mointors

i just bought a vga cable so that i could connect my laptop to my samsung 32" hd tv. when i turned it on, it automatically copied it, which is what i wanted, only porblem was, it had, im not sure how to say it, but subtle waves through the screen, so i was messin about with the settings, now i can get it to go back to mirroring, just extending, so is there a way to just restore the defaults of the display settings, or how would i go about getting it back to be mirrored doing it manually, and if i can, how would i get rid of the wave effect