I have come to the conclusion that you must edit your HUD to remove scoreboard numbers and damage you have dealt, THUS, YOU SHALL BE FORCED TO KILL YOUR OPPONENT SO YOU WON'T HAVE TO CALL OUT DAMAGE NUMBERS.
On a serious note, try other configs and see what works, and edit them to what works is another possibly method. Also if you're not 11, how old are you? You could try to get a job, then save up money to get a new motherboard. Unless you already have a job, then save up a portion of money each month to get a new one. Things take time I guess, there's always trying to defrag your computer/TF2 files for the hell of it.