I had the same EXACT problem.......

Every time I visited certain sites it would say i didnt have the latest version of flash player or javascript was disabled...my computer said differently... we couldnt play games or veiw youtube or even read my emails... 2 weeks later and after trying EVERYTHING advised, I unistalled my "security" thingy (mine was MACAFEE) and everything is back to normal! Its worth a try , it worked for me!!!!!! GOOD LUCK! I KNOW HOW U FEEL!