I'm having a problem with two browsers, Chrome and IE. I normally use Chrome but noticed it's the same with IE, but not Firefox. Basically, whenever I try to use the browser, the dev tools page pops up and starts flickering quickly (on Chrome that part at the bottom of the window, in IE a seperate window). This makes it impossible to use the browser. I first noticed it with Chrome and thought I messed some settings up and tried deinstalling it, and when I started IE to download it again I noticed it had the same issue. Needless to say, reinstalling Chrome didn't help

This started suddenly today as I was trying to clean up my computer - deinstalled a couple of programs I didn't use any more, e.g. couple of games, and also McAfee since I wanted to change antivirus. Then I installed and deinstalled Avast and AVG (Avast because I didn't like it, AVG because that's when I noticed the Chrome issue and thought it was something to do with that). Besides that, I was also using TweakNow Powerpack 2010 to clean my registry and clear out temp files etc.
I went back and restored the deleted registry things using TweakNow, then went and did a system restore back to before I started cleaning up anything at all today - the issue still remains. (I then went and "undid" the system restore so I wouldn't have to deinstall the programs again).
Anyone have any clue what the problem could be or am I doomed to use Firefox now till it breaks aswell?

or any suggestions on how I could try and find the issue? Recovery or safe mode maybe? Everything else seems to be working fine, it's just the browsers. I've tried updating Java and Flash aswell. The only other issues I had today were game freezes due to my display driver and also what I assumed was my CPU (was at 100%, which made me start to clean up the computer in the first place).