Verify that your operating system is a genuine Windows™ 10 / 8 / 7 / Vista / 2003 / XP / 2000 / NT4.0 SP5 / ME / 98SE and it is correctly configured.

Verify that you have the latest DecoTech Update installed.  You can find the appropriated download webpage, based on your serial number, directly at the bottom of the main Tech Support webpage.

Install the latest software driver to access properly the USB key device.  To do so, simply click here to start the download of the "sentinel_hasp_ldk_windows_gui_run_time_installer_8_21.exe" file (22.5 MB).
When the download is completed, open the file and follow the instructions.

	USB Port Sentinel HL Pro (Version 7 Old Model)   USB Port Hasp-HL (Version 7 Older Model)   USB Port Hardlock (Version 6 Model)   Parallel Port Hardlock (Version 5 Fossil)

The «File "hlvdd.dll" cannot be found.»  error message :

To fix this trouble, simply download and install the latest DecoTech Update.  You can find the appropriated download webpage, based on your serial number, directly at the bottom of the main Tech Support webpage.

Random trouble with Windows™ 10 / 8 / 7 / Vista :

To fix this trouble, simply download and install the latest DecoTech Update.  You can find the appropriated download webpage, based on your serial number, directly at the bottom of the main Tech Support webpage.

Sentinel HL Pro, Hasp HL or Hardlock files :

They should be located in the "C:\DDS Inc\DecoTech\bin\Hasp-HL Driver\" folder or in the
"C:\DecoTech Pro\DecoTech Pro V7\bin_v7\Hasp-HL Driver\" folder.

To see the version numbers of currently installed software driver files, double click on the "_Version.bat" file (the ".bat" may not be shown).  File version numbers with higher values than those ones below are correct.  Click the OK button to close the window.

If some of your version file numbers are lower than those above, you should install the latest software driver to access properly the USB key device.  To do so, simply click here to start the download of the "sentinel_hasp_ldk_windows_gui_run_time_installer_8_21.exe" file (22.5 MB).
When the download is completed, open the file and follow the instructions.

USB Port Sentinel HL Pro, Hasp-HL and Hardlock key devices:

Be sure that your computer BIOS has its USB port enabled and working correctly.  If you have installed the latest software driver (above), Windows will automatically detect the USB key device when inserted and it will install the appropriated communication software driver.  The red led of the key device will light to indicate that it is ready to be accessed.  If the red led do not light, try to plug the key into another USB port.

Parallel Port Hardlock key device:

Be sure that your computer BIOS has its PARALLEL port enabled and working correctly in bi-directional mode.  If you connect other hardware (printer, scanner, storage unit, etc) directly to the parallel port key, we give no guarantee that the parallel port key and/or the other hardware will work correctly together.  In such rare case, you will need to purchase another parallel port and dedicate it only to the parallel port key.  So, when you are troubleshooting a parallel port key, do not plug anything else in it.

Finally, before thinking that your key device is broken, try it on a different computer system if possible.