I'm installing the MS Dynamics CRM 8.1 with the minimum required permissions using the xml configuration file, I followed the following link steps: support.microsoft.com/.../how-to-install-microsoft-dynamics-crm-4-0-with-the-minimum-required-pe
Now, my xml file is ready to use, i started the installation by following the instructions:
Run the Microsoft Dynamics CRM server installation. To do this, click Start, click Run, type C: \ ServerSetup.exe / config C: \ configprecreate.xml in the Open box, and then click OK.
but without success because it gives me an error: could not open configuration '....' for additinal details see logfile.
For information while executing just 'C: \ ServerSetup.exe' the installation starts without problem.
can you help me please.

thanks in advance.