Can't burn under 4x

Iv been trying to burn a couple image files using DVD Decrypter and where it says write speed i select 1x… but when the burning begins it goes at 4x.

iv tried different programs and it only lets me burn at 4x, 6x and 8x.

I have the Lite-On 1633S Windows XP SP2 and iv tried this with memorex dvd-r, maxell dvd-r they both say 1x - 8x on the disc.

what can i do?

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