TP-USB Drivers
For most of these operating systems two types of driver are available: Virtual COM Port (VCP)and direct (D2XX). The VCP driver emulates a standard PC serial port such that the USB device may be communicated with as a standard RS232 device. The D2XX driver allows direct access to a USB device via a DLL interface.
You can download VCP drivers from following links or visit Drivers for FT232 for more detailed information.