Well sometimes the styles start to get dated and sites need new better styles, Like this one that uses the defaults for IPB 1.2, But look what me and T3 said
Back it up by typing scanreg /backup then do it. If you get it wrecked, Boot to a dos prompt and type scanreg /restore and select the most recent backup
I just installed SP1 with my installation CD that I oredred and on the reboot I had the fastest boot ever. The little squares passed by only 3 1/2 times before it dissapered. I recieved it 4 days ago and installed it yesterday.