Eventviewer

Okay, I  received one of these phone calls about my computer running slow. He directed me to do a windows r and type in eventvrw of which I did. Then double click on admin. view which brought up about 2000 warnings/errors on my computer. He say's his tech guys can clean all this up for a fee of course of which I knew was some kind of scam. Still seeing these warnings/errors, is this something that Norton people can fix or is this something I shouldn't be concerned about?