NVidia graphics driver installation on XP

I installed a graphics card and said "yes" to overwrite
files with older version during the installation.
Now the card will not install because the operating
system will not function without the original files.
It requires these files from the original system CD which
I cannot find!!!
How can I restore these files without having to do a
complete reinstall?
I have tried every version of the driver installation and
they all do the same.

Thanks

Vijay