This computer will not let me download Mozilla Firefox on it, it keeps telling me file corrupt. What can I do to download Mozilla? I only use Mozilla at home.

I use mozilla firefox at home and I am trying to add it to my mothers computer but when I try and download mozilla it keeps telling my file corrupt. What can I do to fix the problem and download Mozilla? Please help. == This happened == Not sure how often == I tried downloading Mozilla Firefox == == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729)