MSI Deployment Problem in GPO Environment

Question

Hello Friends ,

  In our client network , our product is being installed through Group policy object with MSI .

Each time changes come , we hv to update version in MSI Setup Project (VS2005).

when user install this msi in this environment (GPO), they face message "unable to install a product bcoz newer version already installed" even user try to update new version on existing old version .

at our local development environment , we are not facing this problem.

Also we have set 2 property
  DetectNewerVersion = true / false  (message comes in both)
  RemovePreviousVersion = true 

what can be cause of this ?
1) GPO settings  (bcoz we are not facing in testing)

2) MSI settings  (upgrade code change before since last few versions -which we don't know how it changed)

3) Registry problem might occured at one of client PC ?


Plz Plz help .
Thanks in advance .


Regards,
Yogesh