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Disable Windows 2008 R2 password policy
gpedit.msc to open the Policy Editor
Open Computer Configuration (left hand pane)
Open Windows Settings (left hand pane)
Open Security Settings (left hand pane)
Open Account Policies (left hand pane)
Open Password Policy (left hand pane)
Doubleclick on the Password must meet complexity requirements
Select Disabled
Press OK
Close the Policy Editor
Maybe you need to run gpupdate.exe