Fortunately, I found out using VMs hence simply just restored the hard drive.
Link : NEWSID breaks Windows Server 2008 R2
The solution is to use Sysprep...
- Navigate to \Windows\System32\Sysprep
- Run Sysprep.exe
- Use the 'Generalize' tick bo.
- When you restart, you'll get the install prompts for country, language etc...
Using SYSPREP.EXE to Change SID in Windows Server 2008 and Vista
Sysprep in Windows Server 2008 R2
Replacement for NewSID when working with Windows 7?