Xilisoft DVD programs not recognizing dvd burner?

I noticed they have a wide range of products regarding converting audio/video dvd related. Now there’s only one problem, after trying out some programs none of them appear to be able to burn.

Tried on both pcs and on neither of em i could select a burner from the list.

One pc has an older philips dvd-rw other one was a plextor dual layer burner.
Anyone got a clue?

PS: sorry if the posts misplaced just thought itd fit in better around here as it is related to these conversion programs.