Got rid of security center 2012 virus but now none of my applications will open. says' choose program to open"?

I used malware bytes to get rid of the virus. it was hard to even get that to open during the infection. but now, it seems to have gotten rid of it, but when ever I go to open any application (internet explorer, malwarebytes etc...) the 'choose a program to open this application opens. So, when I choose, say, internet explorer to open up...inernet explorer.... it does not work. I have even gone to the program folder and tried opening up the executable file directly, same result. Anyone know what may be wrong?