HELP! In an attempt to get an Excel file to open automatically when downloaded, I created a path called “docs” in the "at start-up open all files” box. Now, I continue to get an error message that says, “file format is not valid” and documents seem to duplicate themselves. Excel opens but does not allow me to access any of the tabs (file, edit etc.), so I am unable to get in and delete the path that I created. Can anyone assist me?

Does it work better if you renamed the folder to something different than DOCS ?
Excel might be confusing the folder name with a file extension :

.doc
Word 97-2003 Document
The binary file format for Word 97-Word 2003.

Open Excel while holding down the Shift key, this will load Excel without any files.