I tried to download Mozilla Firefox and Opera a few times, but everytime I download the installing thing and try to run it, it says 'File Corrupt'... Very irritating, Where do I download Mozilla Firefox 3 for free with no problems??

Try downloading firefox from http://www.mozilla.com/en-US/firefox/ And use a free download manger to download the complete file. The error message is received as the file has not been downloaded completly.

PS. Data recovery is not th solution