Galletto uses FTDI's FT232R chip so maybe this can help you: FTDI_Drivers_Installation_Guide_for_WindowsXP

I think first you must uninstall the drivers that you installed previously in the Device Manager and then install a updated driver version here.
   
I have not tried it myself because galletto 1226 works plug and play in vista, so Good Luck.

Negative, sir. I glanced through the document and then followed your link for updated WinXP drivers. Uninstalled the old ones I had on the laptop and used the EXE in the link to update. Tested functionality of the cable with the new drivers with wbh-diag and all is fine. The driver may actually work a little better too.

But Galletto still gives "Opening Port Impossible' and that is it. I tried using the COM14 port where the driver first installed the COM port after instaalling the new drivers but that did not work. I reverted back to COM1 which is what makes VAG-COM and wbh-diag work fine. Galletto does not like either of them.

I may not have the right FTDI cable that Galletto needs, but I doubt it. Everything else works over it, and since it is nothing more than a serial port over USB, I do not see how a different cable would be any different. But what do I know.

Something that may help is knowing which COM port Galletto is trying to access. I tried an "strace" of the executable but failed. Strace is the system trace under linux, and since I have Cygwin for using a linux environment over WinXP I tried that. There is no output that is produced from strace, so that did not help. Is there anything equivalent to that for WInXP that I can try?

Crap, this is an uphill battle for me...

I downloaded straight the FT_PROG.zip and dropped it in the real (not virtual) WinXP. The two applications that are in there fail to initialize and simply do not run after they have been extracted with all the contents of the zip file. I also went to the following "Resources" link, which is probably where you went to fetch that zip file, but could not find anything relevant, icluding that zip file.

Linky Clicky

On the up side, I found a link to somebody's POSIX serial programming document and realized that I may be doing something wrong in my serial port initialization when I try to connect to the ECU with my homebrewd linux software. So, thanks for that!

Still at a loss with Galletto.