It could be a couple of things, but I'd look to see if you have sumif.xla in
your XLStart folder and check to see if the Sumif wizard is checked under
Tools|Addins.

If you have it in both spots, I'd keep the tools|addins version and move the
Sumif.xla from the XLStart folder.

If that doesn't help...

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

Walid wrote:

Everytime i open Excel or an Excel document, i get the following error message:

"SUMIF.XLA is already open. Reopening will cause any change you made to be
discarded. Do you want to reopen SUMIF.XLA?"

Whether i answer YES or NO, the application will open normally. It is just
very annouying.. HELP
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W

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Dave Peterson