Digital BW, The Print

I've been using the VMS inkset from MIS for a good 3 to 4 years with 
Keith's curves to obtain a range from neutral b&w prints to deep 
sepia. I'm using an Epson 1280 printer, photorag paper, and have 
always had good results with it. In December I bought a new computer 
with Windows XP, and installed Photoshop CS and now I can't get a 
sepia tone out of these inks. Previously I had Windows 2000P for my 
operating system and PS CS wouldn't work on it so I was using PS 7. 
I can't even find anything anymore on Keith's curves. I've tried 
Roarke's curves and I get dull gray posterized prints. Can anyone 
help me out with my problem?
Thanks in advance,

Evelyn