Hi,
Based on my experience, this issue may occur when we are over the internal Excel limit for the printer list -16KB. As we know, Excel reads the installed printer and the default printer from the following registry-keys. When the Excel limitation is more than 16KB, it will not detect the printer list.
HKEY_Current_User\Software\Microsoft\Windows NT\CurrentVersion\Windows
HKEY_Current_User Software\Microsoft\Windows NT\CurrentVersion\Devices
Meanwhile, as the issue is related to Excel, it is recommend that you post a new thread in our Excel newsgroup. The engineers and community members there have more experience and can help you in a more efficient way.
Excel newsgroup
http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.excel
Hope the issue will be resolve soon.
Regards,
Nick Gu - MSFT