Having stumbled across this before I thought it easier to add the fix here for quicker reference.

When using Veeam’s FastSCP to copy a VM on a 64bit PC you can often see the below error:

“Retrieving the COM class factory for component with CLSID [5F1555F0-0DBB-47F6-B10B-0AB0E1C1D8CE} failed due to the following error: 800700c1”

The following site has a nice quick fix – http://www.everything-virtual.com/?p=279

In brief download the single corflags.exe file and run the below command (e.g. corflags is placed in c:\temp)

“c:\temp\corflags “C:\Program Files (x86)\Veeam\Veeam Backup and FastSCP\VeeamShell.exe”  /32BIT+”

Make sure you run the above as an Administrator (e.g. CMD run as administrator etc) as it caught me out on my first attempt!