I can't play games and now I can't even reinstall the client, it keeps crashing

I had this problem for a while when for some games I would have a horrendous amount of lag and then I get DCd for the entire game with an error saying "You have disconnected. Please check your internet connection and try again." I tried a bunch of things to help my connection to the internet, but one thing I tried was to reformat my hard drive several times just in case it was a virus MITM attack, nothing helped, now I can't reinstall the client at all, I have downloaded many many many different new installers, nothing changed, it always crashes at around 80-87% with telling me the speed is at 0 kbs and then bug splat reports come after it. This has been a problem for over a week now, I want to play, I cannot literally install the game though. I tried having support help me but they are clueless and automated enough as it is already...this is a very frustrating battle...sigh.

Edit: I just checked my client installing, the speed slows down to 0 KBps and then crashes at around 86-87%...I hate this, I feel like I am doing the support team's jobs for them and I am clueless on what to do at this point.