Browse button not launching

Hello. I am a relatively new KNIME user. Version 5.7. I have a couple of workflows. All of a sudden the BROWSE button is not launching in the Excel Reader nodes. Even if I try to create a new workflow, it does not launch. I have searched and read the existing topics but nothing seems to identify a fix. I am getting around the issue by manually update the filepath, but I would like to create new workflows and not have this issue. Is there a solution?