1.) Open regedit. And find HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sptd.
2.) Delete that folder "sptd" in the registry. If you can't, just right-click the folder, and click Permissions. Ask for "Full Control". Do this also to a sub-folder of "sptd" namely "cfg" (i actually already deleted it so i forgot). Just find ways to delete the "sptd" folder in the registry.
3.) Now rename or delete the 'sptd.sys' file found on Windows\system32\drivers.
4.) Download the newest SPTD Layer version "http://www.duplexsecure.com/en/downloads". Install and wait for confirmation to reboot.
5.) After reboot. Try opening the SPTD layer installer again and see if it tells you that SPTD layer is already installed. If it says so, continue on installing your Alcohol 120 or Daemon Tools.
64-bit?
Open regedit and look for this key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_SPTD, try to delete it. If you can’t, try this: go folder by folder (0000 and control), open the permissions dialog, go to advanced, Owner and take ownership of the folder. Don’t try to apply the owner recursively, you have to set it on each individual folder. Then, in the security tab grant full control to “everyone” (again, folder by folder). Now you should be able to delete it. I also deleted the same entry in ControlSet001 and ControlSet002.
Finally, just in case, delete this entry too: HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\System\sptd
Now run SPTD setup again, you should be able to install it and after a reboot install Daemon Tools.
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