Virus evaded, but internet connectivity issues remain...help please?

Ok so my AVG software caught and quarantined 3 viruses that i got from freaking stumbleupon (i know right?!) So anyways i deleted them and i am able to connect to the internet on firefox because i saw on google to change my internet options to no proxy or something like that...but i still cant use internet explorer or play my online game combat arms...something about my connection was refused or something like that ....help :(