Live 8 on windows 64 bit ,Sony Vaio, fast track pro problems

[woodygun]

Bought high end Sony Vaio - i5, 6g ram, windows 7, 64 bit. Whilst using Live 8, playback cuts out for several seconds, crackles, then returns. I'm using same settings as I always used on a much 'lesser' laptop (with Windows 7 32bit) with which I never had any problems. CPU level does not spike before cut-outs and it happens even at 3% cpu use. Any advice would be REALLY appreciated. Thanks. Woody.