Im not really good with computer but try this:
1. Did you install / uninstall anything before/after Ntune? If you did.. Then maybe that is the problem
2a.Your computer may get too hot. Well your computer has this opening where all the air comes out... check it when you dont play a game, then play a game around 15-30mins and if it gets pretty hot it can be a problem
2b. if it gets tooo hot... Open your computer thing (that big thing where everything is inside) and play a game then... DONT TOUCH ANYTHING! and see if you still get the stuttering
(NOTE: iIm not sure if this is safe)
3.Does the computer sounds the same as it should be ? Mostly you hear a fan, but maybe you dont now..
4. Maybe your computer is loading too much programs... Check it out.. You know the ctrl-alt-delete and then processes.. I dont know the english name for it
5.Install a pretty simple 3d game... (
http://www.glest.org/ ) if you get stuttering then it is something else than heat
6. You have this loading lamp on your computer... like when you start your internet broweser it will like turn on and when its ifnished loading it will turn off.. It will probably goign on when you get stuttering
Umm that t-shirt thing... Well if you stretch it too much it wont go back.. You will damage it
But if you dont stretch it too much it will go back somehow... no damage
Maybe you will find the problem like this
