You shouldn’t ever need to change the SID of an object within AD.
Why are you trying to change the SID?
I have done this numerous times. When deploying machines from an image that wasn’t created from sysprep, also virtual machines created from base image. MS/sysinternals has a tool called NEWSID
<a href=”http://technet.microsoft.com/en-us/sysinternals/25e27bed-b251-4af4-b30a-c2a2a93a80d9.aspx “>link</a>