I follow this guide and got it to work using the PL2303 USB interface and a manual reset button. Knight Rider Car Games. I have one quirk that it only gets a COM port assigned and can accept upload if one particular USB socket on my PC is used. And straight after the Arduino program finishes compiling I quickly press the reset button once, dont keep it pressed down.

I am a noob at electronics and what I do is to help not frying my PC USB (I had 2 blue screen's of death in Windows 7 probably due to bad wiring) is to use two diodes on the +5V and +3.3 V voltage outputs on the PL2303. Good morning to you DJ, hey thanks, not so bad now, some days are inherently worse than others but still in alot of pain sadly:-( Do you only have the XL7105 Module that needs the 3.3v to power it or do you also have other 3.3v modules that need to be powered??

Well i have a few solutions, going from the low to high price-wise; 1. You can use a 3.3v voltage regulator to take the native 5v that your kit provides to drop the voltage to the 3.3v that any modules need, would be a good idea to use a decoupling/filter capacitor on the output of the 3.3v voltage regulator;-) 2. Ive made a 3.3v voltage regulator board specially for these purposes, and this will take the 5v and you will get a very regulated 3.3v output that can supply upto 1A output!;-) 3. Theres also a special 3.3v Kit that runs fully on 3.3v so no such voltage regulators are needed, just hookup any 3.3v devices to the kit as it supplies and runs with 3.3v as its native voltage,, but if you have a few devices, option 2 will be the better choice as it supplies upto 1A current! If you want a full Arduino Based 3.3v board (DIY Soldering Kit),, again this will only supply upto 250mA of current from the voltage regulator so if you need more devices to run at 3.3v, options 2 along with another option in conjunction would be the better choice!