I am having the same issue 500 – internal server error when I try to access the admin interface. This is a new WordPress 2.8 installation on a own Win2008 testserver.
The Server has this setup:
Windows Server 2008 32-bit
IIS7
PHP 5.2.9
MySQL 5.1.34
WordPress 2.7.1 have no problem running on this server.
I have try to do a automatic upgrade from 2.7.1 to 2.8.
I get the following error when I try.
“Downloading update from https://www.ads-software.com/wordpress-2.8.zip
Download failed.: Operation timed out after 30000 milliseconds with 665760 bytes received
Installation Failed”
WordPress are running OK, but when we can’t get into the blog so we we have a problem Houston.