If it's not overheating then there aren't very many other reasons for it to power off. 1) You did a clean install of the video drivers, correct? 2) Make sure you have the Windows BSOD enabled (Start -> Control Panel -> System ->"Advanced" tab -> "Startup and Recovery" settings button -> uncheck automatically restart). If you get a BSOD make note of the error number and message. Also check error logs (Start -> Control Panel -> Administrative Tools -> Event Viewer). 3) Another reason for the power off could be because of lack of power. When does it crash--during intense gaming, or while sitting on your desktop?
Are you using a driver provided by emachines (if your wireless is integrated)? Also, are you able to see any wireless networks and is wireless enabled?
I gatther that you are trying to resize your taskbar. Right click on the taskbar. Make sure "Lock the Taskbar" doesn't have a check by it. If "Lock the Taskbar" does have a check by it uncheck it. The functionality should now be back to what you want.
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