Choosing Program To Open Files With?

I was downloading a screen recorder called camstudio and once I downloaded it it asked to choose a programme to open it with, so I chose winrar because most of my other files were opened with this, but then once I chose this all of my icons in the bottom bar were changed to the winrar programme logo, so I thought if I uninstalled the winrar software the problem would be solved, so I did but now all the icons are gone and every time I try and open something it asks me to choose a programme to open it with!