All video gone to black & white

All of my video on my PC has gone from colour to black & white.
I noticed it on Winamp first. I installed 5.03 (or whatever) over 5. Nothing.
When I started the video game NHL 2004, the video clips on it were also in black and white.
I'm guessing something video card-ish?

Any ideas on how to get out of Kansas and back to the wonderfully colourful world of PC Oz?

 

Hey Steverino,
I would like to know a little more about your problem and computer specs.
Is the black and white only effecting gameplay and videos etc. or is it your whole screen all the time.
What graphics card are you using?

 

My vid card's an ATI 128 Rage Pro. For my basic specs, look at my signature.
It's weird... I restarted after running ad-aware etc... and now it's fine again.
No idea why it went to black and white. It was just the video that was b&w... whatever the window size, all formats. I had this happen once before, but it was only .wmv files. This time, all video files being played were b&w. Any ideas on why this may happen so I can avoid it in the future?