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When I purchased this, it came with a driver disk. I installed it onto my XP Pro computer. It worked great on the first thing that I tried, which was my CarChip (www.carchip.com). It would not work on my Visual Basic 2005 Express Edition DF1 program from SourceForge.Net. After exploring around, I noticed that in Device Manager, the description was "Prolific USB-to-Serial" and this was in the Manual.PDF also. I searched on the web and found a more recent driver. The site was http://www.prolific.com.tw/eng/download.asp and then select "USB to I/O Port Controllers". Now find the "PL-2303 USB to Serial Bridge Controller" (second section from the top) and then select the "PL-2302 Software and Drivers". At the top of the page click on the "wd_pl2303_v20019v2028.zip" and save it to your computer. Unzip or explore into this file to find the "PL-2303 Driver Installer.exe" and run this program. After it installs, you will have to re-boot and now all should work great. Mine sure did.
What's great about it: Works Great after New Driver in XP