Hi Jonathan, Pacsone:
Thank you very much for helping me to solve this problem. What I did was first remove the MySql service as you desribed, then I unstalled PacsOne and MySql. Use Window/XP system restore to roll back to the system state before the MySql and PacsOne were intalled. Then I reinstalled
MySql and PacsOne, carefully following the instructions. Every thing work fine now. I hope this experience could help other people in the future.
Thanks again and best regards!
Weijia Su