URL REWRITE PROBLEMS URLS LIKE index.php?GET=...

I have a big problem in my IIS-Setup! 

Every URLs like this type for Example: http://localhost/index.php?GET=(R1) dont work on my setup

Example from web.config:

<rule name="Importierte Regel 3">
<match url="^account/(.*)(|/)$" ignoreCase="false" />
<action type="Rewrite" url="account.php?GET={R:1}" appendQueryString="false" />
</rule>

It shows me a 500 Error . I dont know why .. It is not because my Website , because the website worked on a other server too (IIS)

Can anyone help me with this Problem?

Thanks..