BUG #4029: Failed to get System metrics for terminal services:87

The following bug has been logged online:

Bug reference:      4029
Logged by:          Ch.Narain
Email address:      ln.cherukuri@gmail.com
PostgreSQL version: 8.1
Operating system:   WindowsXp sp2
Description:        Failed to get System metrics for terminal services:87
Details:

i could not install the postgresql ,when i started the installation it is
ending prematurely giving an error " Failed to get System metrics for
terminal services:87", So how to get rid of this and install the software ?
Please help me out.