Reply to Win7 - Disable ACPI? Try this:

I've been having audio issues with Windows 7, even after some pretty serious optimising.

Nothing really serious - but I knew I could get better performance out of my laptop.

I've tried a lot of different ways to get around the Win 7 ACPI issues, and I knew that ACPI was causing some serious hard page faults from using DPC Checker and LatencyMon.

As a last ditch effort, I thought I'd try removing the battery...

Bugger me if all my ACPI problems didn't just stop!

Try it - see what results you get...