I found FT_Prog from FTDI. After reading the user guide for some time I tried to change the Product Description to "TiTaGreMo - SSF Timing" I right clicked on the device and then on "Program device". After that I opened up the Device manager on windows but under the category Ports (COM and LPT) ports my device still stood as "USB Serial Port". What have I done wrong? How do I do it right?
Programming the device name only effects the display name when windows doesn't have an associated driver for a device. Once it locates the PID/VID/Ver in the drivers INF file, it will use the driver-specified names and call it what the driver installer wants.
In order to change that, modify the driver .INF you will ship with your device. On your machine, you will need to uninstall the device from Device manager to uninstall the driver, and then un-plug and re-insert the device with your new driver INF ready.