My PC run on Windows 7 Professional SP1

The Action Center have two important message

1. Turn on Microscoft Security Essentials

2. Change Windows Update settings

1. From the MSE window

Home tab:

- Real-time protection:  Off

- Virus and spyware definitions: Up to date

Click Turn on button

Error message: Real-time protection couldn't be turned on. This operation returned because the timeout period expired

Update tab:

- Virus and spyware definition couldn't be updated

- Error code: 0x80004004  The definition updates couldn't be installed

2. Windows update

Click Check for Updates

Error message: Windows Update cannot currently check for update, because the service is not running. You may need to restart your computer

Changing the various update settings did not help at all.

Restarting the compuer also didn't help