Are you sure you dont meen msnp32.dll ?
I have looked up this error an I can't find any errors with the
DLL file msnup.dll only msnp.dll, but it looks like the msnp.dll is an error for Win 98, but I found msnp32.dll here is the resolve solution for msnp32.dll
1. Run your computer in safe mode with Internet
2. Go here and download the .DLL file: http://www.dll-files.com/dllindex/d...
3. Extract the file to your system32 folder.
4. Restart your computer.