Unable to load or uninstall Photoshop Elements 11 or Premier Elements 11

Not sure what happened, both Photoshop Elements 11 and Premier Elements 11 were working properly.

Now, trying to launch Photoshop Elements 11 gets error message Elements Organizer - Photoshop Elements cannot start or continue because of missing file(s). Please reinstall.

Attempting to reinstall Elements 11 gets error message Error 1316. A network error occurred while attempting to read from the file C:\Windows\Installer\Adobe Photoshop Elements 11.msi

Trying to launch Premier Elements 11 gets message Configuration Error. Please uninstall and reinstall the product.   Error: 1

Uninstall of Elements 11 appears to progress normally, but uninstall ends and install begins, error message is Setup Error 2755. Server returned unexpected error 1605 attempting to install package D;\Adobe Premier Elements 11\PRE 64\Adobe Premier Elements 11.msi

Any help appreciated.

Thank you.