installing problems

New to arduino cant even get program extracted when I extract files and select folder to extract to it then comes up with a message password needed file DATA FLASH is password protected please enter password in box below/

Never seen this before with any zip file I tried to extract

That's odd. Are you sure you downloaded from the right place?

http://arduino.cc/en/Guide/HomePage

Yes downloaded 1.0.5-r2 it from here, It does the same with 1.0.3, found a fix but dont know why it helped. I downloaded the file into a multirotor folder in my documents and was extracting from there, I have many other bits of firmware manuals etc in the same place and they all extracted fine. I moved the Arduino zip out to the desktop and it extracted ok, have no idea why never seen this before.

Thanks for help