AVG 2014 PC Crashes your system Internet

Used to have Symantec's Norton 360, which I thought was getting a bit pricey. Looked around for alternative & computer guru friend recommended AVG. I used their month-long free trial -not bad. Was unaware that price difference between Norton & AVG is due to AVG not advertising their internet protection program clearly, or disclosing that their price does not include certain components which must be added on to get the full-meal deal. Terrible business practice! Paid for AVG after trying Avast, too. This was months ago. My desktop PC hasn't worked right since. Now my CPU usage indicator shows 100% all the time & I believe it's either AVG not performing functions properly, eating all my memory, or it let something through which is now roosting on my harddrive. Either way, this past weekend I had to completely remove it from my PC which was no easy task. At first it wouldn't even uninstall! Hours & hours it took me to perform this simple function. Yuck! Because usage is at full capacity, nothing will load in a timely manner. What a mess & waste of time! I'm going back to Symantec and seeking a refund from AVG -doubt I'll get it, but at least I can stop them from trying to auto-renew their crappy service.