I've got a Windows 2008 SP2 server runing x64.
When i try to access the SharePoint Central Admin site, I just get a blank page. No errors in the Windows logs, nothing showing up in the SharePoint logs. The IIS log shows a 500 error.
I enabled Failed Request Tracing for the 500 status code, which gives me the following information:
ModuleName IsapiModule
Notification 128
HttpStatus 500
HttpReason Internal Server Error
HttpSubStatus 0
ErrorCode 2147942593
ConfigExceptionInfo