If the new build has the same computer name, same user name, and same password... I believe you get pass thru authentication with your older drives secure folders. Problem you have is that they appear foreign to your new build, and data security is getting in the way. I did this way back for early NTFS, not sure if it will work for Win 7, but you can give it a try. All names and password have to be exact alphanumeric case sensitive.