What used to be the norm is now the exception, I had a project that made use of a serial connection, but all my computers lacked a serial port. After searching online I found a cheap USB to Serial cable that convinced me. To be specific it was the Bytecc BT-DB925 built on the PL 2303 USB to Serial Bridge Controller by Prolific. While the built quality was excellent the supplied driver failed to properly install on my Windows 7 x64 system rendering the cable useless. The supplied driver is the PL2303_Prolific_driverInstaller_v1210.exe, which never worked for me.
Instead, the working driver is PL2303_Prolific_GPS_AllInOne_1013.exe. (Hosted locally). The download link at USGlobalSat is broken PL2303_Prolific_GPS_AllInOne_1013.exe Although it says GPS the driver is functional, beats having a useless cable around.
Uninstall the first driver and install the second one, after the installation is done reboot the system and then connect the USB to Serial cable. This seems to be a common problem on the Internet, I just wish the manufacturer would provide the functional driver.