How to measure performance history?

on my dedicated Windows 2003 server

[sdani]

I have a dedicated Windows 2003 Web Edition, hosted at an unmanaged web host.

I have recently added mySQL on the same server and I would like to measure the performance to make sure it is not overloading the server.

How can I measure daily / weekly stats? In other words, how to save what I can see on task manager's performance screen, WITHOUT adding more load on the server. I mean if this monitoring process takes a lot of resources, I don't want it.

thanks guys
sdani