I'm guessing it's going to be the soundcard driver. Drivers are a problem right now with Windows 7. I had a problem with a webcam that worked just fine with XP. No so with 7. I advise you to go to the manufacturer website and look for drivers for Windows 7. Good luck.
You need to download & install sound drivers for your eMachine model. Here is the link to download drivers. http://www.emachines.com/ I believe you also need a word processor to fix your spellings. Good luck