Hi Kevin,
Not enough information. What operating system, what version
of Excel and most important what do you see, and what do you know
that you are not telling us.

What happens if you use Ctrl+break are you looping within a
macro. But take a look at ...
http://www.mvps.org/dmcritchie/excel/slowresp.htm

Clearing your temporary internet files could help.


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HTH,
David McRitchie, Microsoft MVP - Excel [site changed Nov. 2001]
My Excel Pages: http://www.mvps.org/dmcritchie/excel/excel.htm
Search Page: http://www.mvps.org/dmcritchie/excel/search.htm

"Keith" wrote in message om...
Thanks. Excel hangs, and the only way to close Excel is to use Task
Manager. I've given the program an hour to do the calculations, but
it doesn't seem to solve the problem.

Do I need to clear the buffer periodically or something like that? If
so, how do I do this?

Thanks,

Keith