The following items must be installed in order: 1) .NET Framework 1.1 2) .NET Framework 1.1 SP1 3) Update Rollup 2 for MCE 4) .NET Framework 1.1 Hotfix KB886904 (For most users this patch is not needed but Update Rollup 2 cannot be installed if this patch has been installed) My unattended CD does the first three, I let WSUS take care of the hotfixes because I don't want to rebuild my CD on the second Tuesday of each month. Update Rollup 2 is described in KB article 900325