theone1_ from my original post "Also these CDs can be read fine in other machines and were fine before so it's not the discs"
I fixed the system ASPI layer with adaptec files. had to use the earlier forced frcASPI17 as when installed aspi_471a2.exe nero info tool kept saying it was corrupted even after correct install and restart.
then re installed full nero (so have both ASPI layer system and nero).
Now one of the drives samsung 308b is still unable to read any discs (is recognised by xp) was fine before. uninstalled the drivers for the samsung and restart, xp finds ok but still no read. swapped drives to pioneeer DVR 103, reads discs but back to square1 NO LAST SESSION on multisession discs.
flummoxed...could it be a dodgy IDE cable, checked all connections all secure.