I open a donwloaded file from an e-mail and a file conversion box appears.The characters are all wierd.

I can not open a downloaded file from an e-mail or off the web w/o a file conversion box popping up.It shows options to open with msoffice word but I choose that and it opens with all the characters that are weird looking. There is also the issue where every time I open up Mozzila there are portions of advertisements that look like they are in Japanese. I go to the View in the top bar then select Character Encoding.The unicode is selected so I switch to Western (ISO-8859-1) and everything is normal. I close the browser and restart and it goes back to the way it was with the Japanese looking text.