Winternals use to offer a free trial, but they were bought by Microsoft. It appears to have been renamed to Microsoft Diagnostic and Recovery Toolset (You can read about it here.) You can download a free trial from MS by going here. After you install it, you'll find an ISO file in the directory that you installed it. The default is C:\Program Files\Microsoft Diagnostics and Recovery Toolset\. Burn that ISO to a CD and you'll have the same tools that ERD Commander offers.