Sorry, P2P means peer to peer, of file swapping application. Napster, Limeware, etc are all considered P2P applications.
What might have happened is like I stated before you ran a spyware tool and it removed a file from a P2P application and now that has somehow corrupted your file.
You can download a new shell32.dll file from here, SHELL32.DLL
You can then replace the one that is currently on your system.
It also seems that SDMonitor.exe is spyware related.
Max Spyware Detector, bogus "Spyware remover" - for more information, search the Spywarewarrior_List of non-Recommended anti parasite sites/software for "spywaredetector.net"
This was found on bleeping computer when searching for this process.
Edited by Boostman, 17 October 2005 - 03:18 PM.