Disc-to-Disc fine. File-to-disc not?!

The DVD / CD writer that came with my PC recently packed up so I've invested in a new Sony one. I've been copying CDs and DVDs without a problem but when I try and write files from my PC to either CD or DVD it fails miserably (I've even tested with just a 1k file).

I've tried both Nero and Roxio and neither works but is fine for Disc-to-Disc. I'm VERY confused - could anyone give me a few ideas of what the issue could be.

Thanks!

My Sony drives (2) do everything. If you want to try another approach-then download Ashampoo Burning Studio 6. The trial version is FREE and not crippled. Works perfect with both of my drives.

@scg

What does "fails miserably" actually mean?

ie it bombs out pretty much straight away. I'll see if I can get the log files....may make more sense.

Hmm I tried uninstalling Nero to see if there was a conflict with Roxio and it still didn't work. I then reinstalled Nero with the purpose of getting a log file from it - and then it worked!!!! Roxio still screwed but I can live with Nero.