What computer operating system is involved with your Premiere Elements 10?
"From backup"? Do you not have purchased installation files?
Error 6 can be found described as a licensing problem. Consequently, please look at installation of 10 from your purchased installation files.
If you no longer have them, then consider downloading Premiere Elements 10 installation files from the following web site and then inserting
your purchased serial number in them during installation to get your licensed working version.
Be sure to carry out carefully the web page's "Note: Very Important Instructions" in order to avoid an Access Denied message.
Any questions or need clarification on the above, please do not hesitate to ask.