Everything opening in explorer

I know that I hit the wrong key. When I did everything started coming up as the windows explorer icon. Asking me if I wanted to save or run...

I managed to get some of the stuff changed back which is why my Google Chrome is working however... I read the answer about going into run and doing all of that. My problem is I can get to run punch in regedit but from there it cycles through to the explorer bit asking me if I want to save or run. Then it tells me its an unfamiliar program then when i say to go ahead it starts the cycling through never opening that program. it gets stuck. is there an alternative to dis-associating Explorer from all the programs as the default? My Firefox is no longer working either because of this. Help! argh! Sorry for being so computer un-savy. It's very frustrating on my end of this. Thanks to whoever can help me out with this. I really appreciate it! Jeffry