I ran into this problem and read about others having the same problem. Moved from a PC using Office 2K with Windows 2K to one using Office 2K with Windows XP. PowerPoint acted like my ppt.pcb file wasn't even there, even tho I had copied into the correct directory. I read that it may be simpler just to re-customize. So I deleted my pcb file and made a new toolbar with just one icon; this created a new pcb file. I then overwrote the new file with my old one; I figured what did I have to lose? It worked; I had all my customized toolbars! I realize this may not work for everyone or across different versions. But I've gotten so much help here (Word especially) that I thought I'd share, just in case it could help someone else.