Please refer to the Minecraft Wiki on how to reinstall Minecraft for Windows, Linux, and Mac OSX:
http://www.minecraftwiki.net/wiki/Tutorials/Minecraft_Help_FAQ#Reinstalling_Minecraft
Reinstalling your game client is a good way to bug test if you have modded it before (which can cause problems such as glitches, FPS lag, and being dropped from servers).
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