A user opens up two spreadsheets in the same excel window. (both excel 95 and excel 97) She selects a range of cells A3:D12 (for example). She then hit's ctrl-c to copy the cells, then she switches to the next spreadsheet and selects a cell, a range (either and both) then hit's ctrl-v to paste the info. Excel always crashes when you do that. It works with every other spread sheet that we use here and only crashes on these two. No viruses found, neither are read only or have cell protection. Any ideas?

When opened in two different Excel windows, she can copy and paste all she wants and it works fine. It does not do this on just her machine. It does it on numberous machines (well, 4 anyway). Different machines running Excel 95, Excel 97, Win95a, Win95b, Win98 and WinNT 4.0. Thank you ahead of time for your help.