This problem occurs because some computers do not correctly perform a case-sensitive string comparison for the Microsoft.Crm.Application.Hoster CRM Hoster process. In this case, the computers do not retrieve the process name with the correct case.
This problem is fixed in the latest cumulative update rollup for Microsoft Dynamics CRM 4.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
949256 Microsoft Dynamics CRM 4.0 updates and hotfixes