Hi Jamal,
Did the web applications work previously and have now stopped working? or
Are these brand new installations and they simply do not run?
Do you have the appropriate admin privileges on your computer when you installed the software?
Have you checked the status of your web server? (i.e., is IIS working properly?)
Hope this helps,
This is what surprises me the most: these applications are used to work properly + I do have full permissions + my web server is working fine
What might be the issue then?
Hi Jamal,
Something in your OS/web server configuration(s) likely must have changed between the time the applications were working and now not working. I haven't heard of the ArcGIS Viewers for Flex and Silverlight all of a sudden stop working for no apparent reason.
Please contact Esri Technical Support - they are best equipped to help you troubleshoot and diagnose the problem.
Good luck,