ok so im trying to install ubuntu on my computer but every time i try to open the file it says 'windows cannot open this file' right under that it say ' to open this file, windows needs to know what program created it. windows can go online to look it up automatically, or you can manually select from a list of programs on your computer' then it gives me the option to let the web service try to find the program or i can do it manually. can someone please tell me what to do? i deleted the program and downloaded it from a different website and the same thing happened.