Easy...
Click on this line
http://www.rarlab.com/download.htm
Select
WinRAR 3.40
or one of the other language versions that are available.
Be careful when you install it after downloading.
It is perhaps advisable for WinRAR to be
associated with all other compressed file types
EXCEPT .zip
And
If you wish to be able to really deal with almost any compressed file type in circulation, you need
WinZip - Click on this line >
http://www.winzip.com/
and
Stuffit - Click on this one >
http://www.stuffit.com/win/index.html (which is NOT a Mac only application !)
Oooops... The Darth Morgwen got there first ! 