This is perhaps the best tutorial on how to set up Active Directory integration in CentOS.

http://www.linuxmail.info/active-directory-integration-samba-centos-5/

Update:
A related link on setting up Kerberos
http://www.howtoforge.com/samba_ads_security_mode

 

The sfc /scannow command (System File Checker) scans the integrity of all protected Windows 7 (XP or Vista as well) system files and replaces incorrect corrupted, changed, or damaged versions with the correct versions if possible.

Running the command requires an elevated command prompt. A log file of the entire operation is created at C:\WINDOWS\LOGS\CBS\CBS.LOG.

The following command extracts the ‘fixes’ from the log and places it in a file called sfcdetails.txt.

findstr /c:"[SR]" %windir%\logs\cbs\cbs.log > sfcdetails.txt

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