Installation of Deamon Tools Lite is a serious problem when it comes to x86 or x64 versions of windows 7.
SOMETHING ABOUT THE SOFTWARE
Deamon tools lite is a very easy to use software and mostly used by gamers to create an additional or a number of
additional virtual cd/dvd drives for the purpose of mounting image.
WHAT IS THE REQUIREMENT OF THIS POST?
Whenever you will upgrade from vista or XP to Windows 7 your previous version of deamon tools will be no more useable or will not be visible.
Deamon tools is a magical software and it relies on SPTD (a SCSI Small Computer System Interface pass through driver), whenever it is installed.
ERROR FACED BY ALL OF YOU “failed to open service key".
During installation you will find that setup of SPTD will be launched and it will force the computer to restart again and again until and unless you will not cancel the installation progress.
SOLUTION OF YOUR PROBLEM STEP BY STEP
1. Present latest version of SPTD will be 1.60 or whatever, you have to remove/uninstall it through the procedure given below:-
a. Click Open, type regedit in search programs and files there u will find HKEY_LOCAL_MACHINE\SYSTEM \CurrentControlSet\Services\sptd.
b. Delete that folder "sptd" in the registry. If you are unable to delete SPTD folder then you will have to change permissions and proceed as following:-
Click open type regedit in search box and search for this key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_SPTD and try to delete it.
If you are unable to delete it then go folder by folder (0000 and control), open the permissions
dialog, go to advanced, Owner and take ownership of the folder.
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 and delete same entry in ControlSet001 and ControlSet002.
Finally delete this entry too: HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\System\sptd.
c. Now go to My computer drive C, Windows\system32\drivers rename or delete the 'sptd.sys' file found there.
d. Download the newest SPTD Latest version SPTD 1.62 or above will even suffice from http://www.duplexsecure.com/en/downloads.
e. Install latest SPTD version and then reboot.
f. After reboot double click SPTD installer and if it says that SPTD is already installed then good luck.
2. Proceed ahead for deamon tools installation normally.