After Migration to Joomla 3.2.1 -> FastCGI Error ISS Server Error

Migrated a Joomla-Website from 1.5 to 3.2.1. Worked well so far -> can change Menues, Articles an Template and save it. But, as son as a want to save changes under configuration -> Site/System/Server i will get the following Error:

FastCGI Error / The FastCGI Handler was unable to process the request. / Error Details: •Error Number: 13 (0x8007000d). •Error Description: The data is invalid. HTTP Error 500 - Server Error.
Internet Information Services (IIS)

Does anybody know why.
SolenthalerAsked:
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chilternPCConnect With a Mentor Commented:
I see the PHP is ok, but the minimum requirements for  IIs is  v7  for Joomla 3.x
and it looks like you are running v6.0
see this link for details:  http://www.joomla.org/technical-requirements.html

another thought you can try  - is disabling the plugins and extensions one by one.  
unless you upgraded the template/plugins/extensions when you upgraded the joomla files.

also try changing the template to one of the built in templates to see if the problem resolves,

however, its sounds like the version of IIS is the problem
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chilternPCCommented:
what version of PHP are you running ?
anyhow much memory ?
I think you can see this in admin under system configuration.

also might be a good idea to delete completely  the cache as the cache may have the old version ..
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SolenthalerAuthor Commented:
Hi
---------------------------------------------
PHP erstellt für       Windows NT WL31 5.2 build 3790 (Windows Server 2003 R2 Standard Edition Service Pack 2) i586
Datenbankversion       5.6.13-log
Datenbankzeichensatz       utf8_general_ci
PHP-Version       5.4.4
Webserver       Microsoft-IIS/6.0
PHP-Interface für den Webserver       cgi-fcgi
Joomla!-Version       Joomla! 3.2.1 Stable [ Ember ] 18-December-2013 14:30 GMT
Joomla!-Plattform-Version       Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
Browsererkennung       Mozilla/5.0 (Windows NT 6.3; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0
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SolenthalerAuthor Commented:
Forced my provider to update IIS to 7.0 an migrated my Joomla to 3.2.2.
Everithing okay - thanks a lot
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