Help with tsst-h552b

my samsung dvd writer used to write dvds at 8 speed and it took 10 minutes per dvd disc. Now it takes 40-5omin to write a disc using nero or roxio. what could the problem be?
can anyone help me?

i am using win Xp sp2
p4 3.2ghz
250gb hdd
1024mb ram.

did you check the dma status?

need driver

Nope! The drive comes with the OS!