DVD backup problems!

[puzzle28]

I am backing up my DVD's ok using Clone DVD any Any DVD. However, when I play the backup I get 'freezing' and a large areas of squares. I am using Pioneer DVR-106D, WinXP Pro (Service Pack 1), 640MB DDR, 120GB H/D, Athlon 1700XP and BulkPaq Orange discs. Several times now when reading a disc the pc has crashed and rebooted! Is there a known problem with this writer? If so can anyone recommend any other writer? Thanks in advance.