A frequent troubleshooting question is "Do you have the latest version of QuickTime installed on your computer with Premiere Elements and are you running the programs from a user account with administrative privileges?"
The link from the following Adobe web site is the one that has been used to obtain the QuickTime 7 (32 bit version) latest version for Windows 7, 8, or 8.1 64 bit. The current version at that web site is now 7.7.8.
Problem: If you try to install 7.7.8 on Windows 10 to meet the Premiere Elements QuickTime requirement there, QuickTime 7.7.8 will not install and gives the message that the download is only for Windows Vista and Windows 7. The current online thinking on this matter appears to be for the Premiere Elements Windows 10 user to stay with QuickTime 7.7.6 from the Apple web site QuickTime 7.7.6 for Windows The thought is that Apple with straighten out the details with regard to QuickTime 7 on Windows 10 64 bit eventually.
Premiere Elements appears to be unaffected by QuickTime use as 7.7.6 instead of the official "latest version".
The above are the essentials that came to my attention from a user involved in Premiere Elements Windows 10 workflows.
If anyone wants further details on this matter, please see Item 005. QuickTime 7 Requirement For Premiere Elements On Windows 10 in
Acknowledgement to ID attic 10 whose post 35 in
triggered this exploration into Premiere Elements QuickTime 7 requirement Windows 10 64 bit.
Thanks attic 10.