Run time Error 91 when opening Excel

When I open Excel 2002 or 2007 I keep getting "Run-Time Error '91': Object variable or With Block variable not set", with a title of "RecordAtMark", with an "OK" button (no "Debug" button).

There are no files in XLStart folder.

I think that I accidentally removed a startup project or removed a reference recently.

I have atpvbaen.xls (ATPVBAEN.XLA) and funcres (FUNCRES.XLA) open on startup. I think there used to be 3 but I don't remember what the 3rd was (if any).

I have references to "Visual Basic for Application", "Microsoft Excel 10.0 Object Library", "OLE Automation", and "Microsoft Office 10.0 Object Library" checked.
atpvbaen.xls and funcres are not checked.