My MB still wont boot :-S

My macbook is messed up! i cant boot. When i boot normally it says "Please Restart your machine, by holding down the start-button for a few sec...." when i use "Apple-S" and boot in single user it freezes, after telling me the System model name, when i use Windows, i get a blue screen and reboot! I have ipod and another machine with vista installed? What can i do?!?!

hmmm, i would highly recommend taking it to an Apple Store as soon as possible, it sounds like there might be some file permissions, HDD issues, etc. problems that will be fixable without sending it to an Apple factory or something drastic like that, good luck!