You might find a better answer at:
... or, if you post to the windows (or mac) subforum on this site.
I have a few instruments off of GPO that did not load. I'm not sure why, but it can happen.
Composer of classical-romantic style chamber and orchestral music.
Finale 2.4 through 2008b
Laptop PC, windows XP home, 2.4 ghz, 516 Megs RAM
Desktop PC, windows XP home, Gigastudio 3.03, 2 Gigs RAM, 3 hard drives
Apple Mac Pro, 8 quad, 3.2 ghz, 4 hard drives, Apogee duet, two wide screens
Also... GPO, Gigastudio 3.0, Kontakt 3.0, Logic Pro 8, Digital Perfomer 5, KH solo strings, VSL horizon solo strings, JABB, PMI pianos, Sampletekk renaissance flutes, Marimba, percussion, Giovani, Anthrology Celtic Winds and Spiritual Winds, complete Kirk Hunter orchestral library, Kirk Hunter Diamond Library, Garritan Concert and Marching band, Garritan Stradiveri violin and Gofriller cello, True Strike 1 and True Strike 2 and trying hard to learn the other language of music.
arranging and orchestration!