Win32 8.3.3 install fail (sufficient privileges to install system services)

Dear Yapt,

Good day!

My name is Jack from DT Research.We are using postgresql to develop our programs;

Now we face with a problem when I reinstall the program,it show up:
===============
> Service 'PostgreSQL Database Server 8.3' (pgsql-8.3)
> could not be installed. Verify that you have sufficient
> privileges to install system services.
> ===============

Do you know how to fix it?

Thanks very much!

Best Regards!
苏硕 Jack
DT Research(Shenzhen), Inc.
Tel:(86 755) 26998411
Fax:(86 755) 26998400
Mobile: 18665320827
Email: shuo_su(at)dtri(dot)com
Skype: jack_sz_china