It isn't window blinds. It's just an skin with a background. The skin was in this Windows XP version when I installed it. I had found the background somewhere online.
Changed a little, lol. The wallpaper was from this graphics competition, some are preety nice. I'd link you, but then I'd be illegally sharing them
Ah well.
Also, search for Royale noire. It's a theme from microsoft, that can be used on your machine with no apps, that looks amazing. It's the MCP theme but black, so it suits XP.