I am finding that excel 2003 becomes very unstable after I manually
copy a worksheet. VBA macros that normally run fine halt before
finishing, and excel crashes soon thereafter.

Does anyone have any ideas why this would happen?

I am using XL 2003 SP2. When I try to install SP3 the updater
complains that it can't find a file that it needs on my original
XL2003 CD.

Thanks,

Brian