The screen slowly turns negative [like the camera affect]

Whenever I play, It starts out looking normal, then some of the pixels turn negative, then after a little bit it all turns negative, the grass turns pink and it looks like a bad camera effect, however anytime the screen changes, such as when the red shield explodes, or when you start a game or beat a level it goes back to normal before repeating the negative cycle. Its fine at first but it slowly goes to negative every time. My computer runs Windows 7 and is 64bit not 32bit and I'm on a 1920x1080 monitor, i tried changing the in game resolution but that didn't help. Any advice will be appreciated, thank you

---------- Post added at 07:20 PM ---------- Previous post was at 06:48 PM ----------

I think i might need to make my resolution a multiple of 320 by 200 but I dont know how

To change the resolution, look for in Config.CFG with notepad.
"scr_height "X"
scr_width "X"

Put the wanted resolution in the X

Haven't this been talked about before? I remember someone saying it is because of Win7 desktop changing affect needs to be off.

Oh hey, that DID fix the problem thanks!