Chip Pearson has some notes on how to diagnose startup errors at:
http://www.cpearson.com/excel/StartupErrors.htm

And Jan Karel Pieterse has more notes at:
http://www.jkp-ads.com/Articles/StartupProblems.htm

Maybe they'll help.

Melih wrote:

Hello Everyone,

We have a very puzzling situation. We are able to start Excel using the /s
switch for safe mode, but unable to start it under normal conditions. We
have searched and executed a variety of fix problems and still to no avail.
In the Event View an error shows up as Event ID 2001, but there does not seem
to be any information on this Event ID.

What have we done:
Removed and Re-Installed Office
Re-Created Short Cuts
Removed all .xlb files
Removed excel.pip file
Unchecked all Add-Ins
Removed Registry Keys as specified in Q280504
Checked the and changed the Start-Up folders

With each situation above we would restart system before attempting to start
up Excel. We have a hunch that Event ID 2001 has something to do with this.

Does anyone have any further thoughts on this matter? Thanks for your time.

--

Dave Peterson