To avoid error 500 when you first access the administration console when installing ColdFusion 9 on a Windows 2008 server with IIS 7.5 installed, include in the user group "IIS_IUSRS" with "Full Control" to \ Lib \ wsconfig in the Enterprise folder or in the \ runtime \ lib \ folder wsconfig in a standard server. Before you install ColdFusion, make sure that the IIS 6 Management Compatibility features are installed, especially the IIS 6 metabase compatibility feature.
Assuming that you are using the default installation paths (C: \ JRun4 for Enterprise or C: \ ColdFusion9 for standard), take a step-by-step approach:
Start the ColdFusion installer as an administrator. When the initial installation process is complete, but before accessing the online administrator console, complete the following steps:
1.) From the "Start" menu, select "Computer"
2.) In Enterprise install, go to C: \ JRun4 \ lib. For a standard installation, go to the C: \ ColdFusion9 \ runtime \ lib folder.
3.) Right-click "wsconfig" and select "Properties" to open the wsconfig properties dialog box.
4.) Click on the "Security" tab.
5.) Click "Edit" to change permissions for this folder.
6.) Click "Add ..." to add a new user / group.
7.) Enter "IIS_IUSRS" in the "Object Name" field and click "OK" to return to the "Permissions" dialog box.
8.) In the Permissions dialog box, make sure the IIS_IUSRS group is highlighted and click Full Control in the Allow column, then click OK to close the dialog box. Make sure that changing permissions affects all files and folders in wsconfig.
9.) Click OK to close the wsconfig properties window.
Return to the ColdFusion installer wizard and continue the installation by clicking on the ColdFusion admin link. If the settings are correct, after a minute or two a web browser should appear with the ColdFusion admin console so that you can complete the installation.