Andrea,
The asio drivers were never developped for the sblive! These were originally developed for emu, where the sblive contains the same chip.
These were originally ripped drivers for emu.
Due to this, not in all cases they are stable. (depending on other system components/devices)

I don't know which software you are using for audio recording, but just in case you experience problems and if your soundreording software supports directX , a very good alternative are the wdm drivers.
Same or better latency as asio, less system sensitive and rock solid.

You can download the patches free from microsoft.
Creative has official wdm drivers for the sblive cards.

Fred