If you just closed that file, then it should open the next time you open excel.
But if it doesn't, then check to see if it's disabled.
In xl2003 menus, you can use:
Help|about MS Excel|Disabled Items.
You can "undisable" it--but if the file is really bad, you may find that you
have to delete it and use a backup version of the file.
In xl2007, I _think_ it's under:
Office button|Excel Options|Addins
select disabled items from the dropdown at the bottom of that window.
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If it's not disabled, you could close excel and search for personal.xls.
Windows start button|search
Remember to look for hidden files in hidden folders, too.
If you can't find it that way, then try searching using an old DOS command:
Windows Start button|Run
type:
CMD
(to get to the Command prompt)
C:
(to get to the C: drive--change this to the drive that excel is installed on)
cd\
(to get to the root directory)
dir personal.xls* /s
The /s says to search subfolders, too.
Make a note of the locations of the found files.
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This personal.xls file should be stored in your XLStart folder.