Recently, I've been experiencing some glitches with the game.

Yeah! But... well, I don't play that much... but I have a couple of other games where everything is fine... I remember having a similar problem with C&C Generals... everything was flickering there too... but then I somehow reinstalled it, and everything was fine...

Added after 35 minutes
Now, just out of curiosity, I installed C&C, and everything is fine there :)