Hi Ataks,
Please open %SystemRoot%\System32\inetsrv\config\administration.config (the UI configuration file) and look for Rewrite. There should be two entries, one under <moduleProviders>element and the another one under <modules>. Something like:
<add name="Rewrite" type="Microsoft.Web.Management.Iis.Rewrite.RewriteModuleProvider, Microsoft.Web.Management.Rewrite, Version=7.1.0.000, Culture=neutral, PublicKeyToken=1A5B963C6F0FBEAB" />
<add name="Rewrite" />
Please also verify that %SystemRoot%\System32\inetsrv\config\schema\rewrite_schema.xml exists.
Thanks a lot.