1. Go to Registry
2. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
3. Create a new key - SpeicalAccounts
4. Create a new key - UserList
5. Create a new DWORD(32-bit) entry - SysAdmin
6. Leave the value as 0 to hide it.

What it fixes
The troubleshooter helps fix problems that:

• Corrupt registry keys on 64-bit operating systems.
• Corrupt registry keys that control the update data.
• Prevent new programs from being installed.
• Prevent existing programs from being completely uninstalled or updated.
• Block you from uninstalling a program through Add or Remove Programs (or Programs and Features) in Control Panel.

Go to Microsoft Download Page