Open Registry Editor (Start>Run>regedit) Then Go To :
1. "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer"
2. On The Right, Make A New Entry With Right Click On Your Mouse Then Choose "New DWORD Value"
3. Change The Entry's Name Into NoUserNameInStartMenu, Double Click In The New Entry And Fill The Value Data With 1.
4. Press OK, Exit From The Registry Editor.
5. Restart Your Computer.