What's with the pink ring around your tyres? Looks like a wrong transparency or pixel centre setting in the drivers or something?
Hmm yes i had a look and couldn't really find any suggestions.
All i can think of is to try and limit the game to only using 1 CPU core. The game is very reliant on your cpu from what i remember, so this might help.
You could also try downloading microsoft's application compatibility toolkit to see if there is a profile for it in there.
I assume these profiles are only applied if you then create them yourself? Or are they by default part of windows but the ACT just shows you what they do?
I remember using one for Rally Championship 2000 anyway.
How did you record so smoothly on your XP machine? Judging from your specs it seems that your computer is about the same as my althon 64 3200+ and x1950 pro - well you have a better gpu but for recording such a game i dont think that makes a difference?
I've never really been able to record on this computer!
But yer, your CPU occupancy shouldn't be going over 100 or else the game will go into slow motion. (Obviously recording won't help matters - you could try putting the recorder set to use a different cpu core than the game, though obviously not on your single core system).
Try asking this guy as he seemed to have the same problems but judging from his videos has fixed them: https://www.youtube.com/user/ipswich1992
He originally seemed to ask here: http://www.grandprixgames.org/read.php?1,922893,925205
Or if not you could ask this guy: https://www.youtube.com/watch?v=jp3BRZTJVX8
Let us know how you get on.
I've seen a topic say to make a virtual machine and put XP on that but then if you're going to do that you might as well dual boot xp - i'm sure there will be drivers for your hardware, it's not THAT new.
Edit:
Someone says to set the rain probability above 0, basically try 50%.
http://www.grandprixgames.org/read.php?1,985205,994389