Laptop stuck on a loop?

I have a compaq evo n1015v laptop. when i start it up, i see the opening with the word "COMPAQ". then, it brings me to a screen with options of how to start it, such as "safe mode", "safe mode with networking", "last known good configuration", "start normally", etc. i would click on one ( doesn't matter which ) and it would try to load, but then stop and start from the beginning again. kinda like a loop. so how do i fix it? im really desperate and would try anything. im so frustrated that im willing to throw it off the back of a truck and watch it smash to millions of peices!!