change com port by clicking start > right click on my computer icon then properties. Carnt quite remember but on one of the tabs in that dialog there is a device manager button click that. When the device manager opens scroll down to ports and expand. There should be a USB to serial connection in there and in brackets the com port it is attached to (eg. USB to Serial Converter (Com3)) right click on that and properties. on the port settings tab click advanced. in the advanced window there is an option where you can change the com port number (a drop down list). select com 1. If com1 is in use, then you will need to change the com port number of whatever device is using com1 using the same method! But as i said close all programs that may use a com port before you plug the lead in, such as bluetooth software, phone syncing software, Infra red devices, printers etc.
Once your lead is set to com1 open vag com and on the test or options page there is a selection in the top left where you select com 1, 2, 3 4 or USB. Select com1 and click test. If its working it will say port OK and interface found, or something similar.
You dont need the engine on, igntion should do, but i always have engine running because it will show active faults, and my imobiliser and alarm kicks in if ignition is on too long!
I have only ever go vag com working on com1 doesnt seem to work on any others for me :/
