postgresql installation issue
===

I tried to install postgresql 8.4 in my windows 7 (64 bit). But it fails with following messages in log



Initialising the database cluster (this may take a few minutes)...
Executing cscript //NoLogo "C:\PostgreSQL\8.4/installer/server/initcluster.vbs" "postgres" "postgres" "****" "C:\PostgreSQL\8.4" "C:\PostgreSQL\data" 5432 "DEFAULT"
Script exit code: 1

Script output:
 CScript Error: Can't find script engine "VBScript" for script "C:\PostgreSQL\8.4\installer\server\initcluster.vbs".

Script stderr:
 Program ended with an error exit code

Error running cscript //NoLogo "C:\PostgreSQL\8.4/installer/server/initcluster.vbs" "postgres" "postgres" "****" "C:\PostgreSQL\8.4" "C:\PostgreSQL\data" 5432 "DEFAULT" : Program ended with an error exit code
Problem running post-install step. Installation may not complete correctly
 The database cluster initialisation failed.
Creating Uninstaller
Creating uninstaller 25%
Creating uninstaller 50%
Creating uninstaller 75%


I have googled about this and run the command 'regsvr32 vbscript.dll' and it shows the message 'DllRegisterServer in vbscript.dll is succeeded', but it won't solve my issue.

Also I set the default value for {B54F3741-5B07-11cf-A4B0-00AA004A55E8} in registry to the file path of vbscript.dll, but it also solve the issue.

How to fix this issue?