Connect TSOP to prolifc serial
You most probably can't do that. The standard software for a TSOP-RS232 combo relies on the ability to read the hardware serial port very fast. An usb-to-serial cable does not offfer this option, it only offers a windows serial port interface, not the serial port hardware (register level) interface.

One option is to have a microcontroller read out the TSOP and send the decoded information to the PC, like shown here.