Question : Videos have weird outline when resized

Just recently, whenever I play a video in Windows Media Player and use the bottom right corner of the player to resize it, the whole video gets weird outlines. It just started recently, and I don't think I didn't anything differently to my computer. Nothing new installed. I'm running AMD Dual Core with Windows XP Pro SP 2.
I attached a few snapshots of a video playing at normal size, and the a couple snapshots of when I resized it.

Answer : Videos have weird outline when resized

I'd look at your Video card drivers and ensure they are up to date. Also look at codecs or even better stop using WMP and switch to something that's much nicer to use such as VLC (http://www.videolan.org/)