I have already posted on this subject, with no success, so thought i'd try again. I own a HP Compaq dc7100 Small Form Factor PC (running XP) which originally came with only a CD writer and DVD player (not a writer). I purchased a LiteOn 20x DVD±RW, which fits perfectly and set the jumper on the back to master. When I start the PC, it recognises the new drive in the boot menu, and has a menu at the bottom of the screen (save and continue is the option I need). The keyboard and mouse do not seem to work, however, so I cannot accept the save and continue command. If I re-install the old drive everything works again. Any ideas?