Installing Joomla by Web Platform Installer 4.0 error 500.19 - Joomla! Forum - community, help and support

i have installing joomla 2.5 web platform installer 4.0 on windows server 2008 r2 iis7.5, , choose mysql. installation successful, when open page have error:

http error 500.19 - internal server error
the requested page cannot accessed because related configuration data page invalid.
module iis web core
notification unknown
handler not yet determined
error code 0x8007000d
config error
config file \\?\c:\inetpub\wwwroot\web.config
requested url http://localhost:80/joomla/
physical path
logon method not yet determined
logon user not yet determined

same problem in host.
if delete file web.config site start normally.
i have find http://support.microsoft.com/kb/942055
design - delete malformed xml element applicationhost.config file or web.config file.
what problem?

my web.config file:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.webserver>
<rewrite>
<rules>
<rule name="joomla! rule 1" stopprocessing="true">
<match url="^(.*)$" ignorecase="false" />
<conditions logicalgrouping="matchany">
<add input="{query_string}" pattern="base64_encode[^(]*\([^)]*\)" ignorecase="false" />
<add input="{query_string}" pattern="(&gt;|%3c)([^s]*s)+cript.*(&lt;|%3e)" />
<add input="{query_string}" pattern="globals(=|\[|\%[0-9a-z]{0,2})" ignorecase="false" />
<add input="{query_string}" pattern="_request(=|\[|\%[0-9a-z]{0,2})" ignorecase="false" />
</conditions>
<action type="customresponse" url="index.php" statuscode="403" statusreason="forbidden" statusdescription="forbidden" />
</rule>
<rule name="joomla! rule 2">
<match url="(.*)" ignorecase="false" />
<conditions logicalgrouping="matchall">
<add input="{url}" pattern="^/index.php" ignorecase="true" negate="true" />
<add input="{url}" pattern="/component/|(/[^.]*|\.(php|html?|feed|pdf|vcf|raw))$" />
<add input="{request_filename}" matchtype="isfile" ignorecase="false" negate="true" />
<add input="{request_filename}" matchtype="isdirectory" ignorecase="false" negate="true" />
</conditions>
<action type="rewrite" url="index.php" />
</rule>
</rules>
</rewrite>
</system.webserver>
</configuration>

is file distriubuted webconfig.txt?