file extracter

can anyone help when i first started downloading games i downloaded a winrar file extracter from a link on this site it worked for a while but now it wont so after downloading games to my laptop i cant extract them to put on SD card any suggestions please ???

winrar does not stop working after the trial period expires, just click the close button. Also make sure your version is up to date, they sometimes make fundamental improvements to the algorithm, which means all old versions think the files are corrupt.

were can i download WinRar :-\