Do you have any issues using the computer? If not then I'd try not to worry. You aren't the first and certainly not the last to venture into the event viewer and panic. As I already said, if the pc seems to be running fine then don't worry about it.
I think almost everyone does it Bob so your not alone. You look in there and it appears like a real horror show of problems when in reality it's not always as bad as it looks. It's a good place to start looking if you do have an issue but again it's a matter of working out whats good and what's possibly bad but as i said only if you have an issue.