Wifi stopped working all of a sudden

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http://forum.xda-developers.com – Okay, so here i am using my touchpad on my personal wifi at home, and the school's wifi when i'm, you guessed it, at school. They both have passwords and they were working fine. Yesterday, i tried to log into my home network because for some reason it did not connect. I go to the wifi settings and it shows full wifi bars and i hit connect, it prompts me for my password (weird since it was saved), the bars drop to the single one at the bottom, and it gave me an authentication error. I rebooted and tried it again, and again, to the same result. I went to school this morning and the same thing ha (HowTos)