Need advice for a layla20 problem

[smp]

Hoping someone can help with this problem: have a layla20 that has worked superbly for 8 years. Recently moved it from it's original computer (Win98/Sawplus) to my new computer (XP pro/SawStudioLite). Installed the latest driver (6.11 beta). Sound is terrible...static/distortion. Tried every buffer setting combination possible...best is 6 buffers/512 samples...but still the sound is unusable. Have tried Purewave, WDM and ASIO modes...all with the same results. This Dell dimension 8400 has a built in sound driver (Sound Max). Please advise and THANK YOU!