Windows X64 Searches 5 Times Longer Than Windows XP!

Why does Windows Vista x64 search so long, especially when the progress in the bar is at the end and the ring is rolling (a replacement for the sand glass)? When a search is not "nearly instantaneous" it takes nearly forever. That is, when you ask for an Advanced Search of Computer, the bar first goes half-way across fairly quickly. Then it goes more slowly to about 3/4 of the way, appearing to redraw the bar every second or so, then more slowly still to 7/8, etc., getting closer to the end with each redraw - but never quite reaching the end. I watch hopefully as it gets to the little down-pointing triangle, thinking that it will give up when it gets there and report that it can't find what it's searching for. But it doesn't.

It keeps creeping further, past the vertical separator at the end of the Address Bar, and then at a maddeningly slow pace across the red "X" and... hours later, the green bar is still being redrawn and it STILL hasn't got to the end. Windows XP Pro on the same computer (but on another HDD) searches for the same files (on all HDDs) five times faster.