Errors and warnings in Windows Administrative Events?

I got a call from some guys claiming to work for Microsoft and told me to do the following: Click start>Right Click "My Computer">Left click "Manage">Double click "Event Viewer">Double click""Custom Views">Click on "Administrative Events"... show more I got a call from some guys claiming to work for Microsoft and told me to do the following:

Click start>Right Click "My Computer">Left click "Manage">Double click "Event Viewer">Double click""Custom Views">Click on "Administrative Events"

On this page a lot of Error and Warning messages appeared (2,221 to be exact) and I have no idea what they mean. Are they really harmful or simply errors that Windows undergoes on a normal basis. Is my computer infected or something. I was offered to Pay from $80-$150 for these guys to fix it. I said no because it sounded a little too fishy since they had me look and check if there were any "errors" or "warnings" when they had said that there were. What should I do now? I have Norton Anti-Virus and a full scan indicates that I'm safe but those message and warnings are there and I want to know why and if there is anything that can solve it if it needs to be solved.
Update: I have no problems with my computer as it runs pretty smoothly with little to no delay...
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