Thanks all for your replies.
-phantaman - I found 1) and 2) before making my first post.
1) is about the xbox gamepad. Years ago when I modded my first xbox (BBB - the Big Black Box) I also made a cable with a standard USB connector for the gamepad to use with a PC. I still have it but it can't be used for games because of wear and tear over the years. If I move the left analog stick up it stays in the up position on it's own! I've taken it apart and cleaned it which doesn't fix the problem. I still use the xboxBBB for XBMC and control it with a xboxBBB remote.
2) is about the xbox360 gamepad but doesn't help me. My xbox360 gamepad came with my xbox360. Connect it to Win8Pro and it 'just works'. I guess Win8Pro comes with a driver already.
3) I didn't do a google search of this site. Maybe there is a post in there somewhere in which somebody offers a xbox360 gamepad con file.
When I tried to configure the xbox360 gamepad, and I've only tried once, I was really tired which might explain things. Or as I said to Excalibur in a PM maybe it's old age, I'm in my late 40s, and maybe I'm
losing my marbles!
Years ago, I got the game in the week it was released, I configured my wheel for GP4 without any problems. I don't have that wheel, or any wheel, anymore. I haven't played the game for years but after putting together a new PC recently I thought I'd install a few old games including GP4. After having trouble configuring the gamepad I thought I'd have a quick look online to see if somebody has a con file for the xbox360 gamepad.
What it comes down to, and it might be hard for some people to understand, is that I'd really like to play GP4 and the thought of trying but failing to configure the xbox360 gamepad a second time is something I'm trying to avoid. The thought is almost scary - why didn't I have problems years ago configuring a wheel and now I can't even configure a gamepad. I've been using computers since the early days of the Spectrum. My Windows PC is only for games and is not connected to my modem/router unless it has to be. I use an older PC with Linux Debian for online stuff. I'm using it right now. I'm no coder but have no problems with command line/terminal as that's all there was when I was younger. I regularly compile programs.
Well enough of my history and worries. Thanks ginnerchris for the file.