It was a Windows problem--since the keyboard and mouse worked in BIOS, but not when i got to the logon screen. Solution: I disabled the logon screen and it loaded when the computer went right to the desktop.
But how did you disable the logon screen without a working mouse or keyboard? I'm having the same exact problem as the others. All the instructions I'm finding online involve going into the Control Panel, which I can't do b/c I can't get past the logon screen b/c my mouse & keyboard won't work.