Is your login speed very slow? then this may work to speed up your login speed.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\Guardian
Right click over "Guardian" in the left pane.
Left click on "Permissions"
Left click "SYSTEM" once to highlight it.Check "deny" in all boxes that you can at the bottom (Probably only 2)Left click Apply Left Click OKSay "OK" to any warnings about permissions**Reboot** the system