And One more thing when i go in the Evening to my house i make may PC Lock Not Shutdown in the morning when i come it is disconnected from the server the email are not working the internet is not working But when i Restart my PC or Logoff and Login again he problem is Solve Plz HElp ME 
This is the Error Report
Event Type: Error
Event Source: NETLOGON
Event Category: None
Event ID: 5719
Date: 05/01/2010
Time: 7:26:59 AM
User: N/A
Computer: SGNAIT-JED-3111
Description:
No Domain Controller is available for domain SGNA-SA due to the following:
Not enough storage is available to process this command. .
Make sure that the computer is connected to the network and try again. If the problem persists, please contact your domain administrator.
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 17 00 00 c0 ...À
No Domain Controller is available for domain SGNA-SA due to the following:
Not enough storage is available to process this command. .
Make sure that the computer is connected to the network and try again. If the problem persists, please contact your domain administrator.
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.