500 – Internal server error when installing or changing themes

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
		<rewrite>
			<rules>
				<rule name="Main Rule" stopProcessing="true">
					<match url=".*" />
					<conditions logicalGrouping="MatchAll">
						<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
						<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
					</conditions>
					<action type="Rewrite" url="index.php" />
				</rule>
			</rules>
		</rewrite>
        <handlers>
            <add name="php 5" path="*.php" verb="*" modules="FastCgiModule" scriptProcessor="C:\Program Files (x86)\PHP\php-cgi.exe" resourceType="Unspecified" />
        </handlers>
    </system.webServer>
</configuration>

Thats the web.config file as it stand now. I inputted your code in hopes of fixing the issue but it didn’t help.

I ran it from IIS and I got a 500.0 error with these details:

Module FastCgiModule
Notification ExecuteRequestHandler
Handler php 5
Error Code 0x00000000
Requested URL http://www.wonderbeanstudios.com:80/index.php
Physical Path C:\inetpub\wwwroot\wonderbeanstudios_com\index.php
Logon Method Anonymous
Logon User Anonymous

I wouldn’t be surprised if the permissions for web.config are wrong but from what I can tell, it looks right! =/

Okay this is getting weird. I activated the tracing and even though I’m still getting 500.0 errors, the tracing isn’t adding anything to the log folder but in IIS it IS showing it has enabled. This is borderline weird.

This is my only WP site but not the only CMS, I have two instances of CMS sites running on mySQL and a bunch of .NET sites running on MSSQL.

This was my first attempt to use WP as I wanted to test it out for this new site I’m working on so I’m a little in the dark about how WP works but assuming it’s similar to the other php CMS, the settings look identical to the other sites.

In the event viewer all I’m seeing are timeouts of the Application pool to my WP site and each log entry corresponds to 500.0 errors that I initiate. Only problem is I’m not really sure what that tells me except that something isn’t working right.

However I activated WP DEBUG and I got this message:

Notice: Undefined index: activated in C:\inetpub\wwwroot\wonderbeanstudios_com\wp-content\themes\tipztheme\functions.php on line 109

Notice: Undefined index: preview in C:\inetpub\wwwroot\wonderbeanstudios_com\wp-content\themes\tipztheme\functions.php on line 109

Parse error: syntax error, unexpected $end in C:\inetpub\wwwroot\wonderbeanstudios_com\wp-content\themes\tipztheme\header.php on line 56

So would that lead me to believe that the theme is bad and I should toss it and try another?