limewire comes up when i start the comp...even when i take the option off

when i exit out it automaticly gos right back in...i have tryed removeing it with add/remove programs and noo effect

i have tryed individualy removing the files but what ends u happening is it says that it cant be removed because it is in use by another person or program

help this is litteraly destroying my computer causeing great deals of lag and useing all of my cpu

it has also stoped CNTRL+ALT+DELETE from working i think...it isnt working anymore but this might be unrelated

please help me this is URGERNT