I'd double check under:
tools|options|general tab
"at startup, open all files in:" <xl2002+ wording>
"Alternate Startup File location" <before xl2002 wording>
And once more for the XLStart folder(s).
If that doesn't work, maybe just looking for those three files would help.
What are the names of the other 3 files?
If you close excel and search for these 3 files, maybe you'll find them in the
XLStart folder.
Use Windows start button|search
to look for the 3 files.
If you find them and move them to another location, maybe that would be
sufficient.