(2nd Part):
IF YOU'VE SUCCESSFULLY UNZIPPED THE FILE, PLEASE SKIP THE NEXT PARAGRAPH
If you've not got the right software to unzip the file which you downloaded, you need - you've guessed it - another download! Download IZArc (for free) from here:
http://www.izarc.org/
That file is IZArc35.exe. Double click on it to install IZArc.
Once IZArc is installed, you can now double click on AP650.zip and IZArc will open with AP650.zip shown in the right-hand pane. Right-click on it and select 'extract'. Then close IZArc.
Now, whether you had unzipping software or you had to install it, we've finally got to the position where we've unzipped that original file which you downloaded. This will have created a folder called AP650 (which, unless you chose another location, will be in the same folder as your original download). Double-click on the AP650 folder. You'll now see a file called AstraPix650.exe. Double-click on this file to install the driver. You might need to restart your PC before it will recognise the new driver.
Hoping that we've finally got it sorted!
Chris