Thanks - you could try a reinstall - sign out of Evernote and opt not to keep a local copy of your notes. Use Revo Uninstaller Free to completely uninstall Evernote, then download the latest version from Evernote.com and power your machine off and back on before reinstalling.
If that doesn't fix the issue with your notes, export them to an ENEX file, delete the originals and then re-import as 'new' notes. (This will remove any internal links that may exist in or to those notes.)