|A main cause of freezing is overheating. Since it froze from day one, we can rule out dust and dirt buildup. Emachines are notorious for their cheapo power supplies. you could try a new power supply like this |
It has a single 12 volt rail which is actually the best design for a power supply. You can also monitor your cpu temps. It's possible the cpu could use a fresh coat of thermal paste. Easy enough to do. Have a look at this link for instructions.
I see the machine came with Norton Antivirus. If you use that, I would dump it in favor of Microsoft Security Suite or possibly a free antivirus like Avast Free Edition.