Trying to give something back to the Community...
If you’re seeing an error 25006 when trying to install a MP on a Windows 2008 Server then this KB from the Configuration Manager Support Team Blog should help:
“We posted this solution a while back but it's proven to be so popular that it was converted to an official Knowledge Base article. You can find our original post here but the test of the KB is below:
When attempting to install a System Center Configuration Manager 2007 Management Point (MP) on Windows Server 2008, the setup may fail with the following errors:
MPMSI.LOG [13:52:07] Enabling BITS [13:52:08] @@ERR:25006 MSI (s) (DC!FC) [13:52:08:085]: Product: SMS Management Point -- Error 25006. Setup was unable to create the Internet virtual directory CCM_Incoming The error code is 800CC801
Error 25006. Setup was unable to create the Internet virtual directory CCM_Incoming The error code is 800CC801 CustomAction CcmCreateIISVirtualDirectories returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
MPSETUP.LOG <08-27-2010 13:43:26> Installing E:\Program Files (x86)\Microsoft Configuration Manager\bin\i386\mp.msi CCMINSTALLDIR="E:\Program Files (x86)\SMS_CCM" CCMSERVERDATAROOT="E:\Program Files (x86)\Microsoft Configuration Manager" USESMSPORTS=TRUE SMSPORTS=80 USESMSSSLPORTS=TRUE SMSSSLPORTS=443 USESMSSSL=TRUE SMSSSLSTATE=0 CCMENABLELOGGING=TRUE CCMLOGLEVEL=1 CCMLOGMAXSIZE=1000000 CCMLOGMAXHISTORY=1 <08-27-2010 13:51:30> mp.msi exited with return code: 1603 <08-27-2010 13:51:30> Backing up E:\Program Files (x86)\Microsoft Configuration Manager\logs\mpMSI.log to E:\Program Files (x86)\Microsoft Configuration Manager\logs\mpMSI.log.LastError <08-27-2010 13:51:30> Fatal MSI Error - mp.msi could not be installed.
Note that the failures are observed on Standard, Enterprise, x86, and x64 versions. The failures are observed in the following circumstances:
As of right now, the easiest way to resolve this issue is to remove and reinstall the BITS component. If the ConfigMgr 2007 Management Point role was already installed then it will also be necessary to remove and reinstall that role once you've done the same with BITS.
For the latest version of the article see the link below:
KB2419559 - System Center Configuration Manager 2007 Management Point install fails on Windows Server 2008 with “The error code is 800CC801”
J.C. Hornbeck | System Center Knowledge Engineer”
Read the complete post at http://wmug.co.uk/blogs/cliffs_blog/archive/2010/09/21/configmgr-2007-new-kb-system-center-configuration-manager-2007-management-point-install-fails-on-windows-server-2008-with-the-error-code-is-800cc801.aspx