OK I have got a bit further. There is nothing of use on Mfg's website.
Tried installing Windows XP with both drives connected (IDE and SATA). Press F6 when promted and put floppy in as instructed. Windows then recognizes SATA drive. Managed to get as far as copying WinXP files to folder (formatted new drive) but then system freezes. Each time I try, I get a little further (got to 52%). I am having to use install CD from my laptop as I can't find original from my PC. Could this be causing the problem or is it something to do with the size of the new HD (160gb)? Any ideas?