Hello, the following solution WILL cause you to lose all of your current data on your Acer Aspire One. I typed this up myself, I learned from experience.
To do what you are asking, restart your Acer Aspire One, then while it is starting up, you should see a white screen that says Acer as seen below (Not my picture). I'm not sure of the key combination but try Alt+F8, Alt+10, or Alt+F11. You should see a black screen (As I remember) but wait about 2 or 3 minutes and Acer eRecovery Management. Follow the steps to do a factory restore. ALSO: If your computer does start up (Mine wouldn't) you can go to start>All Programs>Acer eRecovery Management and follow the steps there. Your Acer will be like brand new.
Hope I helped.
Startup Screen:
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