Hey...!
There can be many reasons.
Try to uninstall the PSE 11 and the related apps. Use a cleaner tool for removing.
Sometimes, when we delete or uninstall, certain files stay back and these clash with the new install files. So, use a cleaner tool to remove all the stuff related to PSE 11.
For your reference, I have pasted the link to get the CLEANE TOOL. Surely, browse the under pasted link
Please click on Manually remove Photoshop Elements 11 | Windows