You need a web.config file in the root directory of RevCMS, this should work:
Code:
<rule name="rule 1i">
<match url="^(|/)$" />
<action type="Rewrite" url="/index.php?url={R:1}" />
</rule>
<rule name="rule 2i">
<match url="^([a-zA-Z0-9_-]+)(|/)$" />
<action type="Rewrite" url="/index.php?url={R:1}" />
</rule>
<rule name="rule 3i">
<match url="^(.*)\.htm$" ignoreCase="true" />
<action type="Rewrite" url="/{R:1}.php" />
</rule>
<rule name="rule 4i">
<match url="^(|/)$" />
<action type="Rewrite" url="/dash.php?page={R:1}" />
</rule>
<rule name="rule 5i">
<match url="^([a-zA-Z0-9_-]+)(|/)$" />
<action type="Rewrite" url="/dash.php?url={R:1}" />
</rule>
If that doesn't work, have you installed PHP correctly on IIS?