How do i completely get rid of my old 3rd party themepack?

hi i had an alienware red themepack i downloaded from a youtube video that was an all in one (it patched everything in the themepack without having to download a bunch of stuff) but i got bored of it and decided to download the iso apple/mac theme from the theme section of this forum. its perfect and looks amazing but i cant get rid of the old icons from the alienware theme and i also cant get rid of the stupid aalienware dock from stardock that automatically downloaded from the original thempack too it really sticks out against the mac theme and im stuck on how to get rid!

its mainly the my computer icons etc, the back and forwards button on folders such as my computer, downloads, my docs and the battery icon and sound button are still bright red.

the start orb was stuck on the red alien face too but i managed to get rid of it by using startorbz to pick one to match the new theme

thanks for the welcome and reply :) im running the cmd thing now, the dock isnt in the program files list or anywhere in my download folder which is why im so stuck on getting rid of it :S theres no option to uninstall it either which is annoying when i right click on it

rebooted and my themes working great now and no sign of the alienware! thanks for the help :)