Photoshop :: Nikon Digital Mess

I have a custom-made PC with a 146 gig hard drive and 3.25 gigs of ram, and am using PS 11.01 as part of CS4 Extended. And I think I've made a mess--maybe not.

I recently acquired a Nikon D90, and with it I shot some 450 frames of an outdoor show in Raw + fine. Instead of using the Nikon software, I imported them all into PS, reduced their physical size, and saved the reductions as TIFS for further editing. Eventually, I thought to convert them to JPEGS at 72 dpi for the customer's on-line slideshow. (This is how I've always done things with scanned film and slides.)

My 450 TIFS all have a slight magenta cast. I called Nikon tech support, and they told me that as long as I didn't do any color correction to them, my final products would be without a magenta cast on my client's computer. However, when I copied a few of the files to my laptop, they turned out to have a heavy magenta cast.

Is there anything that I can do to save the 450 TIFS, or should I just start all over again and import with the Nikon software?