computer programs changed to Corel icons and .ink extension

Hi - I need HELP.  Yesterday when I was working with Corel Photo Paint X6 and Corel Draw X5 all of a sudden all my desktop program icons changed to show Corel Draw X6 -- also an .ink extension appeared behind all the program names.  (this also happened in my "all programs"  list.)  Everything I click on takes me to Corel Draw X6.   Anyone have any suggestions for me to get things back to normal???  Thanks.