how to set Nero Burning room speeds? help

When you pull up the burn dialog box there is a window for the write speed. The only time this doesn't come up is if your hardware does not support multiple write speeds.

By the way, it always defaults to the maximum write speed, so you have to change it manually each time. If there is a way to get it to default to a lower speed, I haven't found it yet.

I think you can do this in the Nero Toolkit. I've never actually done it, so I don't know. But if you go to options you can select a CD speed and click apply. I assume that will slow it down to the correct speed. The toolkit will also test the CD speed, and even if you have a high speed drive, it will find the speed that works reliably and then set Nero to work at that speed. There is also a way of forcing a slower speed, that is a bit more complicated, but it is described in Nero Help. Just do a search on "read speed" and then click on setting read speed.