Burning with instant copy

[louthewiz]

I'm a newbie to all this i purchased the sony dvd burner and instant copy updated it,also dn loaded dvd decrypter and the update.Now here is the thing I cant seem to understand ive burned several backups with no trouble using decrypter and instant copy to compress and burn but several dvds I tried like die hard jurrasic park etc that I have tried to back up makes instant copy crash when it tries to read video quality and converting or compressing and I was wondering why it happens with these movies I want to back up but not with others .I have the sony 500a 512mb ram an amd xp 1.8 chip with win 98se plus a 60gig hd and hardly anything else installed in my computer and I need to be pointed in the right direction to correct this problem so if anyone can help me please do...