Newish computer, Generic PC, 1.2GHz AMD Athalon, 320MB RAM, you'd think that was plenty of power, but the machine hesitates at everything. Any idea what I could do to get rid of that?

Example, I type in a password for my Network (Home) and after I type it, I look at it and have to wait for it to enter itself. It does this on almost everything. From Start-up to having multiple windows open. I have a Cable modem so I'm not sure if it's only online.