When you try to open the Reports folder in Microsoft CRM you get the error:

Error An error has occurred. For more information, contact your system administrator.

This happens sometimes if you have separated CRM, SQL and reporting Services

This hapaned on a clientcomputer with Windows 2000. The solution was to enable Integrated Windows Authentication in Internet Explorer under “Internet Options – Advanced – Security Section”

Links

http://microsoftdynamicscrm.blogspot.com/2007/11/error-message-when-you-try-to-access.html
http://www.microsoft.com/downloads/details.aspx?FamilyID=51bf9f20-bd00-4759-8378-b38eefda7b99&DisplayLang=en