comda, what driver package are you trying to install, is it sp38266? I've had experience of HP messing up their driver downloads, I think I have an identical machine in the cupboard somewhere at work and if so, I'll see if I can dig it out and try what you're trying, see if we can work this out together.
Also, HP setup files by default extract to C:\swsetup, is there a swsetup directory on your old drive? If so, try matching the spxxxxx numbers to driver packages, one may be what you're looking for and that folder should contain the files you need.