All Icons Have Converted To Microsoft Word

I sorted my desktop, and put the desktop shortcuts (Microsof Word, Excel, outlook etc...), onto task bar (next to start button) however I have come back to PC and they have all seemingly have converted to Microsoft word. When I open start menu, all my recent programs have again converted to word.When I have opened any of these a word document opens, a load of gobbildygook, as well as can not open in dos mode.I have managed to cercumnavigate word and excel, by opening one of my exixting files starting a new document and saving this to desktop, but can only do this with paint, word, and excel.