Dynamics 365 , MS Dynamics CRM 2011, 2013, 2015, 2016 Hospital: Exception message: The specified domain either does not exist or could not be contacted. MS CRM 2011

i did the installtion and when i was just accessing the MS CRM site, i got the below error....

and the below is the details from event viewer....
the details shows clearly that the account "NT AUTHORITY\NETWORK SERVICE" does not have access to the AD.
i am not sure about this. WHY?
i have done other instalaltions earlier with that.
still i tot, just to change the service account, so i ran the upgrade and changed the accounts to some AD account, then it ran HAPPILY... :)

Event code: 3005

Event message: An unhandled exception has occurred.

Event time: 15/6/2013 5:21:53 PM

Event time (UTC): 15/6/2013 9:21:53 AM

Event ID: d77f2b8efd124a9ebac200209080acab

Event sequence: 6

Event occurrence: 1

Event detail code: 0

Application information:

Application domain: /LM/W3SVC/1/ROOT-1-130157616769092004

Trust level: Full

Application Virtual Path: /

Application Path: C:\Program Files\Microsoft Dynamics CRM\CRMWeb\

Machine name: HQ07WACRMUATDB

Process information:

Process ID: 6696

Process name: w3wp.exe

Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:

Exception type: COMException

Exception message: The specified domain either does not exist or could not be contacted.

at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)

at System.DirectoryServices.DirectoryEntry.Bind()

at System.DirectoryServices.DirectoryEntry.get_NativeObject()

at System.DirectoryServices.DirectoryEntry.Invoke(String methodName, Object[] args)

at Microsoft.Crm.SecurityUtils.CheckMembership(Guid principalId, Guid groupId)

at Microsoft.Crm.Caching.OrganizationSettingsCacheLoader.LoadCacheData(Guid key, ExecutionContext context)

at Microsoft.Crm.Caching.ObjectModelCacheLoader`2.LoadCacheData(TKey key, IOrganizationContext context)

at Microsoft.Crm.Caching.CrmMultiOrgCache`2.CreateEntry(TKey key, IOrganizationContext context)

at Microsoft.Crm.Caching.CrmMultiOrgCache`2.LookupEntry(TKey key, IOrganizationContext context)

at Microsoft.Crm.BusinessEntities.SecurityLibrary.IsOrganizationSpecialUser(Guid organizationId, Guid userId, ExecutionContext context)

at Microsoft.Crm.Caching.UserDataCacheLoader.LoadCacheData(Guid key, ExecutionContext context)

at Microsoft.Crm.Caching.ObjectModelCacheLoader`2.LoadCacheData(TKey key, IOrganizationContext context)

at Microsoft.Crm.Caching.CrmMultiOrgCache`2.CreateEntry(TKey key, IOrganizationContext context)

at Microsoft.Crm.Caching.CrmMultiOrgCache`2.LookupEntry(TKey key, IOrganizationContext context)

at Microsoft.Crm.BusinessEntities.SecurityLibrary.GetUserInfoCommon(IOrganizationContext context, Guid userGuid)

at Microsoft.Crm.BusinessEntities.SecurityLibrary.GetCallerAndBusinessGuidsFromThread(WindowsIdentity identity, Guid organizationId)

at Microsoft.Crm.Authentication.CrmWindowsIdentity..ctor(WindowsIdentity innerIdentity, Boolean publishCrmUser, Guid organizationId)

at Microsoft.Crm.Authentication.WindowsAuthenticationProviderBase.Authenticate(HttpApplication application, WindowsIdentity userIdentity)

at Microsoft.Crm.Authentication.AuthenticationStep.Authenticate(HttpApplication application)

at Microsoft.Crm.Authentication.AuthenticationPipeline.Authenticate(HttpApplication application)

at Microsoft.Crm.Authentication.AuthenticationEngine.Execute(Object sender, EventArgs e)

at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Request information:

Request URL: http://hq07wacrmuatdb/ICA/default.aspx

Request path: /ICA/default.aspx

User host address: fe80::65f7:80e8:48e3:afef/

User: CIRISDEV\ICACRMAdmin

Is authenticated: True

Authentication Type: Negotiate

Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:

Thread ID: 8

Thread account name: NT AUTHORITY\NETWORK SERVICE

Is impersonating: True

Stack trace: at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)