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Please refer below link for more details, these will help you to resolve your issue..
http://salesforce.stackexchange.com/questions/8058/unable-to-lock-row-error-while-running-all-apex-test-classes
http://salesforce.stackexchange.com/questions/20921/can-anybody-explain-the-unable-to-lock-row-error
P.S. If my answer helps you to solve your problem please mark it as best answer. It will help other to find best answer.
Thanks,
Sandeep
Salesforce Certified Developer