Cataclysm Error

So, I Downloaded Cataclysm from Warmane Downloads Option, With torrent as it's necessery.
it downloaded and when i open it, only 3 files appear: Data(folder), BackGroundDownloader.exe, Battle.net.dll
Then, when i try to Unzip it in folder, such an error appears
http://a.pix.ge/k/7h8ki.jpg
i downloaded it a day before, but Because of lack of electricity caused My PC shutdown, same error eppeared. i thought it shattered it or something.
But Now Everything was fine, an all the same happens.
please help.
Thanx in advance

Winrar is not a good choice to unpack zip files with. It may work in most cases but not with guarantee in all. Try 7zip or winzip. Additionally strangely torrent files can get corrupt tho i have no clue and know of no sollution to such cases (experienced it myself on one other big download).