Windows clients cannot join to the AD

I setup before two weeks ago domain controller and I joined three computers to the domain and also Created three user accounts and every things was fine after the trial period I tried today  to join office computers to the AD but I encountered those errors.

1. I joined  first PC  to the domain but it refused to accept user /password account and this is the error "your computer could not be joined to the domain because the following error has occured: Access is denied". I removed computer name in the computer list in the AD but nothing was changed and finally it refused to join to the domain and this is the error that appears "your computer could not be joined to the domain because the following error has occured: Access is denied"
My AD was fine even yesterday  so please help me to sort out this.
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fahad44Asked:
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Martin81Commented:
Check the user account your using to join the computer to the domain has permissions to do so. To be sure use an account that's a member of the Domain Admins group to join the computer to the domain.

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fahad44Author Commented:
the account that I am using to join the computers to the domain is \\Domainname\administrator.
Martin81Commented:
Is the \\ a typo or is that how you're typing the username in?
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fahad44Author Commented:
sorry for confusion it's domain name\administrator
fahad44Author Commented:
This is uneditedipconfig/all from the the DC
C:\Users\Administrator>ipconfig/all


Windows IP Configuration


   Host Name . . . . . . . . . . . . : server1
   Primary Dns Suffix  . . . . . . . : save.scsom.org
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : save.scsom.org
                                       scsom.org


Ethernet adapter Local Area Connection 3:


   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Broadcom BCM5709C NetXtreme II GigE (NDIS
 VBD Client) #49
   Physical Address. . . . . . . . . : 00-26-55-4A-DA-9C
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.1.40(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : 192.168.1.40
                                       196.201.207.40
   NetBIOS over Tcpip. . . . . . . . : Enabled


Tunnel adapter Local Area Connection* 8:


   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : isatap.{B60FE0E9-40A9-49A3-875F-9F1EB14AE
37C}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes


Tunnel adapter Local Area Connection* 13:


   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 02-00-54-55-4E-01
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
This is uneditedipconfig/all from the clients
C:\Documents and Settings\fahad abb>ipconfig/all


Client ipconfiguration

Windows IP Configuration


        Host Name . . . . . . . . . . . . : fahad
        Primary Dns Suffix  . . . . . . . : save.scsom.org
        Node Type . . . . . . . . . . . . : Unknown
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : save.scsom.org


Ethernet adapter Local Area Connection:


        Media State . . . . . . . . . . . : Media disconnected
        Description . . . . . . . . . . . : Broadcom NetXtreme 57xx


Gigabit Cont
roller
        Physical Address. . . . . . . . . : 00-18-8B-CA-98-EB


Ethernet adapter Wireless Network Connection 4:


        Connection-specific DNS Suffix  . : save.scsom.org
        Description . . . . . . . . . . . : Dell Wireless 1390 WLAN


Mini-Card
        Physical Address. . . . . . . . . : 00-19-7E-38-CC-C4
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.1.71
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.1.1
        DHCP Server . . . . . . . . . . . : 192.168.1.1
        DNS Servers . . . . . . . . . . . : 192.168.1.40
                                            196.201.207.40
        Lease Obtained. . . . . . . . . . : Monday, March 12, 2012


7:51:46 AM
        Lease Expires . . . . . . . . . . : Wednesday, March 14, 2012  7:51:46 AM
Exactelly I am using domain name\ administrator account to join the clients to the domain
my DC operating system is windows server 2008  and my clients are either XPsp3 or windows 7 64/32 bit
sorry for misunderstanding I am not using trial DC  but I meant that I  make one trial period for the DC after I configured to see if there are any problem. ACtually my DC was fine the day before yesterday. we have 2 different subnet in our LAN   even I noticed  this morning the second subnet that is different from DC subnet cannot see and ping the DC   my second subnet is 10.5.50.1/24  and my first subnet the the DC resides is 192.168.1.1/24 so please help
Thank you all
fahad44Author Commented:
I can ping the AD/dns ip from the clients that are using different subnet but in the server side I can't ping the clients ip despite  I turned off clients firewall and antivirus so may be my dns isn't configured correctly  and I am unfamiliar with windows OS platforms
fahad44Author Commented:
in addition to that when the pc connects to the network it says "save.sfc.org 3 (unauthenticated)" internet access.
fahad44Author Commented:
any reply from the experts.
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Windows Server 2008

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