Game runs unplayably slow

[Grendus]

Hey. I bought this game a while back and loved it. My old laptop running windows xp broke (started draining power faster than it could charge), so I got a new one with windows 7. Took a while to get around to it, but I finally managed to get the creeper world installer off my old computer and onto the new one.

Before installing the full game on my new laptop, I had played the demo at normal speed. Now that I've installed the full game though both the demo and the full game are running so slow it takes minutes to load up even the menus. It's confusing because a month or so ago, when I was playing the demo, the game ran at a good speed. The only thing that's changed since then is a few service packs and installing the full game.

Has anyone else run into this problem? Is there any good way to fix it?

Edit: Never mind. After uninstalling both and reinstalling the full version, it started working at normal speed. Still don't know what caused it, but it's working now.