Wow I had the same problem...
Im no expert but this worked for me...
Like it was already said. Remove ever thing including the drivers you also probably installed.
Turn the Puter off
Then hook up just the vga cord to the PC...
Boot it up
Using the software form the link provided in the other thread run just the Setup .exe
Towards the end when it searches com ports.. it took forever. Give it time.
Get a beer or something. (every one knows it waits untill your not looking to finish up...

)
Hit ok and all stuff
The program loaded and you plug in the touchscreen/
Install the driver from the same folder I chose the last one.
And it worked.