You install SharePoint 2010 and just after running the SharePoint Farm Configuration Wizard, you browse to the Central Administration Site. However, you get a 503 error and the page does not load. After checking IIS Manager, you find the application pool process for the Central Administration site has stopped. You restart it and browse to the site, only to find that browsing to the site actually crashes the application pool process.
Check to ensure that all your SharePoint application pool processes have ‘Enable 32-Bit Applications’ set to False.
Run Inetmgr -> Application Pools
Select your SharePoint Application Pool -> Advanced Settings -> Enable 32-Bit Applications
Set the value to False.
Do an IISReset /noforce