I never had this problem before. I basically wanted to try out MTA:SA today (I had it installed but never played it) and I upgraded MTA to 1.4 or something like that. After a while of testing out MTA I decided to head back to SAMP. Everything worked fine until I decided to alt + tab out of SAMP. That is when this comes in:

That is basically my screen every time I get out of the SAMP window. This NEVER happened before. They way I fix this each time is to CTRL + ALT + DEL. That is the only way to normalize the colors.
What is this? How to prevent this?