Windows could not connect to the System Event Notification Service service. This problem prevents standard users from logging on to the system. As an administrative user, you can review the System Event Log for details about why the service didn’t respond.
Also my aero theme does not work. So everytime i switch on my pc, i go to services then restart the themes service to allow my aero theme to work.
I am using windows 7 32bit, and i recently bought a wireless usb.
See this fix,
Your wireless usb driver may have caused it.
Is the Themes service set to “Automatic” for the startup type?