Dell Vostro 1220. 2.4GHz, 4Gb, Mobile Intel 45 Graphics, Samsung SSD PM800 128Gb, Win7 Pro.

Hi all.  I'm having a nightrmare with my New Dell Vostro 1220 and DPC Latency.  I installed my Native Instruments and Ableton software, then plugged it into my keyboard and audio interface and it immediately had pops/crackles/dropouts.  I found the dpclait software and ran it and It shows spikes at 4000 us every 4 seconds.   I've found loads of posts about it, both here on the Dell community and other forums.   I've used the dpclat tool to monitor my DPC as I've tried the following to resolve it with no success:

1. Disabled everything in Device Manager that can be disabled one-by-one and collectively

2. Run the system with and without the battery plugged in

3. Updated all the drivers I could, both from the Dell Drivers Support Page and the OEM support pages

4. Reinstalled Windows 7

I got the laptop on the 23/12/09 and logged a call with Dell Support as soon as I found out, but they feel that this isn't a problem with the laptop, but rather a problem with my software.  I tried to explain that there is no software on it and that the dpclat software is just for testing DPC latency but I don't think I have managed to communicate this to them!

I've found various 'fixes' like disabling ACPI, throttling the Processor, installing Windows Diagnostics tools to work out which process/program is causing the spike, but none of them work for Windows 7/me:

I bought this laptop specifically to do music and find that music is the one thing it can't do!

Does anyone know of anything else I can try?

Thanks

Steve