how do I remove AVG

Simply put, I am a techno retard. I tried to remove AVG and it instantly started 2012. Now when I try to remove it says the installation was corrupted (because I cacelled it when it started to install). Purchased 360 after I acquired a virus, computer was sending e-mails out on its own in the middle of the night. This problem seems  resolved, but still have problems with speed- IE shutting down/not responding. Should I seek professional assistance,via geeksquad? Took Malwarebytes off, I assumed any other security program would not be good with 360. Was this a mistake? Thanks for any advice.