was getting the following error after installing php 5.2.6 on IIS with IIS CGI configuration:

PHP Warning: PHP Startup: Unable to load dynamic library ‘C:Program FilesPHPextphp_pgsql.dll’ – The specified module could not be found. in Unknown on line 0

I resolved this by replacing the .dll in this location with my .dll from a previous install (php 5.2.5) … you can probably use the .dll from any version

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