My mother-in-law just gave me her old(emphasis on the word old) Emachine T4010. It has a bunch of crap like music, pictures, ect. and it was seriously slowing this thing thing down. So I wanted to system reset the computer and found it was really easy. Basically you:
Turn on the computer (duh)
Press F10 (Boot setup)
Press F11 very fast
The last step was kinda tricky because you have to do it very very quickly. However after that, it gives you the option to 'destructive reset' the computer which is the one you'd wanna do. Don't know if it will help anyone, being as the emachine is pre-hurricane katrina, but the info to reset it is here if y'all need it.