Apologies for not being very specific.
I mean as a SharePoint subsite, I have added the following to the Web.config file:
<system.web>
<pages enableSessionState="true" enableViewState="true" enableViewStateMac="true" validateRequest="true" />
<trust level="Full" originUrl="" />
<httpModules>
<add name="Session" type="System.Web.SessionState.SessionStateModule"/>
</httpModules>
</system.web>
That is not the entire contents of my <system.web> section, but highlights the extra entries I usually add to relieve any problems when running a web app as a sharepoint subsite.
I managed to run the install ok, but when i try to browse to the main site, Internet Explorer says "Internet Explorer cannot display the webpage".
Thanks,
Adam