Click on Start > Search > For Files and Folders
Select 'All Files and Folders'
In the 'All or Part of the file name' box, type the following:
make sure you have the asterisk.
Set it to 'Look in' local hard drives and hit search. Wait for it to finish, and it might have located the nero log file for you. If so, post it to your next reply. If not, I have a few more ideas