Well Mikeice, that's a pretty vague description (at least for me). I'm
not as experienced as some of the regular posters but here's my advice.

First I'd ask if both computers are using the same version of Excel. If
not, you may have a compatability issue. Not likely though.

Next, access the VBA project under each computer and compare how
options are set. One in particular is the Error Trapping setting.

Set both to the same as the error free computer. If that works, fine.
However, that is still an error in the code that needs to be corrected.
Enter debug mode and fix it.