Ya is possible and am very sure you will have to uninstall both :

uninstall both versions listed of Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly,) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

From a Dos Administrator Command Prompt (find dos in the menu and right click or search cmd.exe and right click for Admin) run SFC /SCANNOW = SFC<space>/SCANNOW reboot if anything fixed.

Reinstall with Current Release Firefox 57.0.3 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.

i'm sorry, but this all seems over my head and a little scary. Maybe i will just leave it alone. Thanks

Will be a conflict. all your passwords and bookmarks and more will get scrambled up.

Very easy to do.

Make back up of the profile and bookmarks.

Run the Windows command which is a common dos command that everyone should know or pay money for some one else to run it and charge you.

Uninstall both.

Reinstall with Full Version Install.

Step by step.

Thanks. I will try it when I feel more brave or see if I can find someone who can. I printed the directions. I greatly appreciate your help