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Please check the follwing links
http://social.msdn.microsoft.com/Forums/en-IN/sqlsetupandupgrade/thread/06fc5c42-9d5d-4331-a4b9-210559411eee
https://connect.microsoft.com/SQLServer/feedback/details/576412/-the-process-cannot-access-the-file-c-windows-syswow64-perf-mssql10-50-mssqlserver-sqlagtctr-dll-because-it-is-being-used-by-another-process
September 17, 2012 at 6:41 am
#1538565
Please refer the Article:
http://support.microsoft.com/kb/929151
May 3, 2011 at 4:56 am
#1318967