Thanks Raistlin12000... Yep... it's to do with how NT file system works... ...it cleverly protects system files and folders... it just looks like Windows sometimes thinks that the poser folders are worth protecting from PBooost!!!!! Believe me... I've tried everything to free up the libraries for PBooost under these circumstances, but no go. Eventually I conceeded that the tester app was the only way to allow me to release the program...! I'm really glad you are finding it useful, even with the restriction of not being able to use it while Poser is running under XP. Thanks! Howard:)