Complete lock up in returning to Excel 2000
 

Not sure if this belongs here or in Office, but this only seems to happen
when I'm using Excel.

If I'm in Excel and I use the send as attachment icon to send a file in
Lotus Notes (the company's choice - not mine), it will go to Lotus Notes and
I can send the file. However upon my returning to Excel, my entire PC locks
up. The screen freezes with both the mouse and keyboard being completely
non-responsive. All I can do is reboot the computer. Aside from not using
this feature is there any way to prevent this?