Hey,

Have you ever played Navyfield before? If so make sure all old files are deleted (How to: http://navyfield.com/Community/Forum/View.aspx?num=26405&pagecount=0&page1=1&searchtype=0&category=E01&searchvalue=&sort=5).

If not please check out the technical section to see if either one of those solutions applies to you: 
http://navyfield.com/Community/Forum/List.aspx?category=E01

I'll move your post to the section mentioned above.