Graphics Glitching

That pretty much looks like your graphic card or drivers are messed up.

If you just recently experienced these glitches, might be a driver update your computer downloaded (personal or auto downloaded).

If you recently installed some programs try to find related graphic issues with those programs, since they can contain "updates" which can mess things up.

uhhh yeah there is such a thing as a "dying" video card, i had one.. if you push it too hard and it overheats without proper/sufficient cooling (in my case, a second hand card that i didnt know was supposed to have a fan on it until after the issues similar to yours started and i came across a factory-default picture of it WITH fan), since the video memory ic's aren't all in one for the total amount of onboard ram, one ic can start to degrade from excessive heat (its just silicone after all) and cause memory issues (similar to what can happen with your system ram) which results in corrupted textures as you're getting. as i've said i've had the same thing happen to me, except in my case everything was fine for a while and running smooth no problems then suddenly after a couple hours of playing something 3D and graphics intensive i'd get the entire 3d-app go all "blocky" and scrambled (like the chat font and genie portrait in your pics) but cover the entire window (tho in windowed mode, background applications like my desktop and taskbar were unaffected) and even closing and reloading the game didnt help, had to shut down and let it all cool for a while before the graphics would unscramble.. adding a large fan to the card's heat sink helped a bit but only delayed the eventual graphics corruption, running a trial version of a system benchmarking utility that includes video ram tests gave a message along the lines of "Video Ram is failing, please replace as soon as possible" or similar message (cant rememebr the exact wording the app used but that was basically it in a nutshell).. i dont see what tracking your heating is gonna prove except that it may in fact be overheating (which i'd think is more then apparent), you can check the same thing yourself by rebooting and goin into the cmos system info page (where it shows cpu temp, board temp, fan speeds, etc) immediately after this corruption happens (just press reset and deal with the windows whining about improper shut down later) and see if the board temp is outside the "safe range".

Fans are cheap, dirt cheap, catch is where are you gonna put it? if your case has a side hole for a fan cutout, those are usually placed directly above where the video card sits for the specific reason of extra cooling on the video card, just add a fan or faster fan to there, if it doesnt then might wanna look into getting a custom fit plexi side panel (also usually quite cheap, its just plexi with a hole in it and a few **** holes)

the less nice option of adding a fan (assuming your card already has a fan on it) would be to epoxy a cpu fan to one of those metal spacer slats that fill the expansion holes in the back, on a bit of an angle, and put that in the slot directly beside the video card and move all other cards as far from the fan as possible to optimise airflow.

This may just delay the inevitable tho as in my case, even with good cooling the card still "glitched" after some time of "peak" use until i got tired of it and just got a new card (with the added bonus of a faster gpu and double the video ram) for a decently cheap price