How do I set or start from beginning, like brand new

If you want to take the computer to factory default.
Try alt+f10 at the startup when you see the acer logo to go into e recovery option
you can take the computer back to factory default
else
restart the computer
start tapping f8 in advance boot options..go to repair my computer
then select the language and then enter your username and password
in recovery options..go to factory image restore which will take the settings to factory default

You need to Format the Computer Completely to do that.....

If you recieved a Recovery Disk with your Computer you can just insert it and follow the Instructions!!!!!

Good Luck!!!!!