Description:
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I did set error_log var in php.ini and tested the phpinfo() function.
Result: Firefox and IE loaded the page one second and then forwarding to: connection reset.
I tested it with mysql_connect() too, same result.
I comment error_log variable then, all was ok.

Used PHP5 (php5apache2_2.dll) as modul in Apache, Apache as service. Modules commented out: mysql, mysqli, pdo_mysql

Reproduce code:
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phpinfo();
//or
mysql_connect("l","root"); mysql_query("SET NAMES utf8"); echo mysql_error();

Expected result:
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The phpinfo, or an error of mysql/nothing

Actual result:
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I commented error_log in php.ini.
Now I dont have the problem anymore.