I am so glad I found this forum!
I will be trying the “no audio” solution suggested here and report my findings. Here’s what I now have (besides no MSN IM audio capability):
******************

MSN Messenger Version 6.1.0203
Windows 98
Location of RTCD11.dll files:

C:\WindowsSystem
C:\WindowsWinsxsx86_Microsoft WindowsNetworking.RtcDll_6595b64144ccf1df_5.2.21_x-22_d6bd8b93

The file in each directory is of the same origination date (8/4/03) and same Ver: 4.2.4949.1001
However, the .dll file in the System directory is 903,248 bytes
and the one in the other directory is 848,896 bytes.

-Charles in Phoenix