Using Windows 98 and Office 2000.

I have a file containing an Excel Macro which starts and runs successfully
whenever the file is opened. But if I run it from Windows Scheduler when
Excel is already open it opens a second copy of Excel which creates other
problems and then hangs..I see nothing in my program which would cause this,
so maybe it's a feature of Windows Scheduler.

Has anyone run into this problem and can you give me some pointers on how to
fix it.

Thanks,

Jim