HTTP Error 500.19 - Internal Server Error

hi,
I have a problem when synchronizing web publication.
I begin by giving you an insight into my soft installed:
-sql-server 2005
-windows 7even so IIS7
I created a publication MaPublication.I made a right click on publication->
Release Local> MaPublication then I chose configure synchronization Web.Then,
next-> sql server mobile-> created a new directory select default website -
>next->in Alias: SQLCE-> 2 messages appear successively OK OK-> next->

clients connect anonymously-> next-> OHH now when I click on the Edit tab to
change a user account error message appears:
The program can not open the required dialog box because no location has been found.Close this message and try again
When i write http://localhost/SQLCE/sqlcesa30.dll in my navigator, this error appears:
HTTP Error 500.19 - Internal Server Error
Description: The requested page cannot be accessed because the related configuration data for the page is invalid.
Module IIS Web Core
Notification BeginRequest
Handler Not yet determined
Error Code 0x80070005
Config Error Cannot read configuration file due to insufficient permissions
Config File \\?\C:\Program Files\Microsoft SQL Server 2005 Mobile Edition\server\SQLCE\web.config
Requested URL http://localhost:80/SQLCE/sqlcesa30.dll
Physical Path C:\Program Files\Microsoft SQL Server 2005 Mobile Edition\server\SQLCE\sqlcesa30.dll
Logon Method Not yet determined
Logon User Not yet determined

What is the problem? Is it a problem IIS??
Thank you for your contribution