To clear event logs, run following powershell script as administrator:
Code:
# Clears all of your event logs
Get-WinEvent -ListLog * -Force | 
% { $_.logname;Wevtutil.exe cl $_.logname };Wevtutil.exe cl system

EXIT
EXIT
For instructions on running a powershell script,see
http://www.sysnative.com/forums/show...ll=1#post28982

Script also available as download at:
http://sdrv.ms/QQ53hm