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You can do 3 different things for this task, if you wish to COMPLETELY reset your minecraft, simply go into the command bar & type %appdata% (enter) and right click on a file labeled .minecraft and hit delete. The next time you start minecraft the application will download a new copy of the data after you sign in. If you want to clear your worlds then just delete them all from inside the menu. If you want to reset ALL the minecraft everything then delete .minecraft & the shortcut then you have to go to the site to get another copy but you will have NO DATA that minecraft ever existed except if you have keyloggers installed on your computer. (lolz)
make a new file and save it
go to notch website or jeb website...download the 1.7.3 or a newer one and in app data > roaming > .minecraft > bin > delete minecraft and replace with your downloaded one then rename it from minecraft (1) to just minecraft
It means, that your account is hacked. delete your .minecraft folder (backup save files) and change your password on minecraft.net. Redownload minecraft and it´ll work.