Pentium 4 300GHz PC has 2 DVD drives (Pioneer DVD-RW-DVR-107D & a JLMS XJ-HD166S-R). When I insert a CD into either DVD drive, windows XP SP2 hangs and I have to manually reboot. I upgraded the firmware for the Pioneer, disconnected one of DVD drives & still got the problem with the other DVD. Once in awhile I can start an installation from a CD, but inevitably the PC freezes. Everything else works fine. Any ideas?