Windows Registry location for Start-up Items

Login to Windows as administrator user. Now type “regedit” in the Run window. Press enter. This will bring the Registry Editor application.
Expand to the following key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
As shown in the screen shot below the key will list the items that will start on logging to windows.You can delete the unwanted entries from the right pane [Please take a backup of registry before dealing with it]

Also you can check one more key
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
This key belongs to that of the current user. From this key also you can delete unwanted entries.
This key is for user specific startup setting while the first one is for machine specific startup setting. The entries under the first one will affect all the users of the system, while the entries under this key will affect only the current user. In our case this is the administrator user of the system