Sorry for the delay ...
Launch regedit ("windows key" + R)
Type regedit and then "enter"
Accept the user control (it launch regedit as an Administrator)
open the keys (the left window)
:
hkey_local_machine
==> System
==>ControlSet1001
==> Control
==> SessionManager
In the right Window, you will find a key named BootExecute
Double click on it and made your chenge
Then, reboot.
I suppose we have to do this each time we launch iolo registry optimization.
I saw, as I'm typing this message, that the second autocheck command is not present.
I hope this can help you.
You will find on the net a lot of explanations about registry editing. Have a look but think about your "limitations" about system and registry manipulation.
I'm not responsible of any disorder on your system in case of error