Any way to reinstall NVIDIA kexts/drivers?

I had Leopard running just fine up until a week back when I lost power to my iMac which corrupted a bunch of files, unfortnately it would seem that something to do with the display drivers had been affected. At the time I couldn't get the login to show and just ended up with the grey Apple logo and a frozen progress gear. However, I could tell the that the thing was actually booting fine as the disk continued to churn AND I could actually remote onto it using Logmein!
So, I kind of took a shot in the dark and remotely installed the Lion upgrade hoping it would also replace/fix/repair the NVidia drivers/kexts... But... it didn't... I had the same result.
Anyway.. I then found that if I booted in Single User Mode and removed the Nvidia kext's it would all boot perfectly, but clearly it was now using base or default drivers as I can't play any video and the screen updates quite slowly.
Now I'm kind of stuck, since there is no Lion disk to pull the correct nvidia drivers from and the ones on my Leopard install disk are not compatible...
Any ideas?
Thanks!
Phil

Resolved this issue, might be of use to others...
Basically I managed to partition the Lion HD (luckily I had enough space to do this), re-downloaded the Lion Install App, ran it and installed a fresh copy of Lion on the new partition.
I then simply used the Migration Assistant to copy everything over from the old partition to the new one - worked a treat, apps, settings, folders, even dropbox, all working perfectly... SO FAR

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