[Double post soz pls kthxbai ] Ok, I installed TF2 again, this time I deleted the TF2 folder in my hard disk but after installing/updating I still have very low framerate (and still the ugly models, because of something in the autoexec that alterated the models, that's for sure). Also I checked, it's the same problem in L4D but L4D2 is ok(but they both are based on the source engine, so that's weird that only one of them works correctly). Another thing, I've the impression gmod starts to be a victim too, I mean in Zombie Survival especially (singleplayer is ok and I tried to see on Noxious -shame on me - if I had low fps but I didn't have enough time to check that) the fps often go down between 45-20-25 which is quite annoying (but it's not as worst as TF2 though). On Steam Support's side, nothing, I'm still waiting but I think they won't answer me (and I didn't get any confirmation from the french Steam support, cause I told you I've asked them too). The suspects, for me, are: Graphic card failure(?)/pilot, Windows 7(but that would be strange because those who have W7 don't seem to bug), processor bug (strange too because my other games seem to work fine :/ ), Direct X(???) Also I've put Steam in compatilibity mode for Vista, it displayed a message that it's not recommended etc etc but that's still buggy in game. Only Steam Support can really help me now I think, unless I find the source of the problem before. :/