where is the device manager in emachines E725?

Hi,

One solution would be to uninstall/reinstall the Touchpad driver of your laptop.
- To open Device Manager, press the Windows key + R at the same time and a run box will open.
- Type in devmgmt.msc and click OK.
- Once Device Manager is open right click on the Touchpad driver then reboot your laptop and it should reinstall the driver automatically upon reboot.