To Learn Change The Name Of SID In Windows 7

I just want to generate a new SID in my Windows 7. I read a lot of topic (Symantec, etc.) about Sysprep but it is difficult when you only want to change the name of SID in Windows 7.
If Sysprep loses profiles, installed software, it becomes useless to use an image file.
The unattend.xml solution seems difficult too. Can you please help?
