Workbook runs slow on some computers

I have a complex workbook which runs a lot of VBA code.  It runs in excel 2003, 2007 and 2010. Some computers with excel 2003 it runs very slow, other computers very fast.  The RAM, CPU and HD size are very similar.  Search a lot of places, but can not solve why its very slow on some computers.

Things I have done!
defrag
Page File Space

PLEASE HELP!!!
tru-numbersAsked:
Who is Participating?
 
als315Commented:
"Some computers with excel 2003 it runs very slow" - it is opening slow?
Read this article:
http://support.microsoft.com/kb/2570623/en-us
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