I can´t enter to minecraft after play the button start, then theres a problem withGame out put

i just update my java, because the computer say me to do it, i did it and then i realize that there´s a problem, cause i can put the launcher, but i can´t play minecraft because there´s i think a java problem, and in the launcher appears a game output page, i´ve got the version java 7 update 21 because i thought that the problem was with java so i uninstall the java 8 that i had that caused me the problem, please give me some advise , thank you