Use the link in my signature to go to the FAQ. Read the topic entitled 'Getting to know Eraser 6'; as a new user, you will find a number of things you should know. One of them is how to read the log, which will tell you what the errors were. Another is guidance on whether to worry about the error messages or not. A third is what you need to do to run Eraser as Administrator, which is almost certainly what you need to do.