pretty weird ...
Firstly, you should check if, but some mysterious ways (windows power!), your nrpe is not trying to be launched twice (like having 2 services configured, or 1 service and 1 in your start menu ...etc)
Also, I had a look at my own nrpe logs on NT, and they don't really look as yours (my logs are a bit more extensive ...). So, maybe you could try to uninstall every thing that is NRPE related, and install a more recent version.
Or, if it doesn't work, get rid of nrpe and install NsClient++ (it is an agent that combines nrpe, nsca and maybe some other things I didn't care about at the time :))