Thanks guys, I fixed it. I just did a system recover, which was luckily just a couple days before I downloaded CCleaner. So now my computer is as if i never downloaded it, and Youtube is running just fine now. Next time, if I want to do CCleaner, I'll make sure I research a bit more about it and take the time to read thru all the options that CCleaner gives me. To be honest, it was kinda too much for me to handle, so I just decided to do all the recommended settings to clean it up. I should have read thru the options a bit more. Or maybe CCleaner can make it a bit more user friendly, to us average Joes.