You can find the drivers here on Newertech's legacy support software page:

http://www.newertech.com/tech_support/support_legacy.php

... download NuPowr Cache 1.2 and NuPowr System Update

... you don't need these extentions to install an OS - about the only use I've found them is to correctly report the CPU speed. The cache extension isn't necessary as your card doesn't have onboard cache.

JB