The Windows drivers for the SL50 series data loggers should be installed when the TempIT software is installed.
If this fails or the driver becomes corrupted, it may be necessary to re-install the drivers.
First of all find out if your Windows operating system is 32bit or 64bit. You can check this by holding down the Windows key and pressing the pause / break key. The system type will be shown in the system section in the middle of the pop up window.
Once this has been noted, open the Windows File Explorer and navigate to C:\Program Files (x86)\TempIT V4\Drivers\1Wire
There are two files listed here. Depending on the operating system noted earlier run one of the following.
For 64bit operating systems, run the file starting 1wire_driver_x64
For 64bit operating systems, run the file starting 1wire_driver_x86
That will install the correct driver and TempIT should function correctly going forward.