The other thing to ensure is that the burner is not on the same IDE cable as the HDD, although burning at a max 4x is typical of DMA problems as Geno points out.
Edit: DMA might be enabled but what is the "Current Transfer Mode" showing as ?
And don't worry about the bad english. I doubt that many of us english speakers could write a question in a foreign language. Your english will no doubt improve just as Geno's has over the past year.