In the old Taco Bell commercials with the chihuahua, it would say "yo quiero Taco Bell" meaning I want some Taco bell, but I am also seeing a song that says "Te quiero..." and that also means I want, but doesn't te mean you?

"Yo" dose mean I.
Te does not mean you necisarily. it is also the formal way of say you guys or Y'all.

It means "I want you."

"Te quiero" means "I want you." "Quiero" is the first-person present conjugated form of querer. The "te" is a reflexive.

Te quiero, as a general rule, has more of a personal connotation. Depending on the context in which it is used it can mean "I want you" (said in a deep husky voice!) or "I love you". Te quiero and te amo, are generally interchangeable, although in some cultures te quiero is more sexual and te amo is more familial, whilst in other cultures, the reverse is true. In the film Spanglish, when little Christina (aged 5 or 6 at the time) says te quiero, it obviously means "I love you"...

Te does mean you. But in the spanish sentence format, Te is actually the direct object of the sentence. Quiero is the first person form of querer meaning want. If you wanted to translate the sentence in order of the words Te (You) Quiero (I want), therefore it would be more easily translated to meant that "It's you I want". It is used to mean "I want you" or "I love you", though the more accurate translation of "I love you" would be Te amo.