NBNS NetBios Query from Excel

OK... I'm stumped. Excel is freezing every 30 seconds for about 7 seconds. I loaded Wireshark to watch/analyze my traffic. Each time this freeze occurs, there is an NBNS name query to a name that I do not recognize. I'm assuming it is a server name that may have been on an old network. However, I've flushed my DNS and flushed my Netbios via "nbtstat -R". Also, "nbtstat -c" does not show the server name. I've searched the registry and the entire C: drive for the server name that it is trying to query, with no results.

If I run Excel in Safe Mode, this issue does not occur.

Any ideas???