Admin Domain account locks out.

My supervisor has two domain accounts, one is a membe of the Domain Admin group and the other is a domain user account.  From time to time he will need to run programs as a domain admin while logged on to his Windows 7 machine with his domain user account.  After doing this a couple of times his domain admin account will lock out.  Does anyone know why this would happen?  We have a windows 2003 domain controller.
BrianSDGAsked:
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AwinishConnect With a Mentor Commented:
There can be manu reason & it can only be find out by various troubleshooting & calculation,few are mapped drive,user is logged & in other system password is changes,authenticate as a services, virus tries to spoof the password etc.

There can be conficker worm in the network mostly conficker lock domain admin account.
http://www.sophos.com/products/free-tools/conficker-removal-tool.html

You can use netwrix account lockout troubleshoot tool & it really helps.
http://www.netwrix.com/account_lockout_examiner.htm

http://blogs.technet.com/b/instan/archive/2009/09/01/troubleshooting-account-lockout-the-pss-way.aspx

Netwrix is good tool to find lock out.

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BrianSDGAuthor Commented:
ggupta7, thanks but these links don't quite fit my situation.  You can perform the same actions on an XP box and it does not lock out the account.
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BrianSDGAuthor Commented:
Liked last link.
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