Update: I updated my sound driver directly from realtek instead of MSI's version and now it work's with the fixes. The problem may have been that the MSI driver was 32Bit.
My current system spec is in my profile. (Windows 7 X64 Ultimate)
The game in having problem with is Team Fortress 2 and L4D2.
L4D1 works fine as does Assassins Creed 2: Brotherhood on Steam.
Iv'e tried both the fixes and none work.
(FFFFFFFF, FFFFFF, dec 50, 1000, 100000) with MMCSS on or off. Rebooting after each property change.
Turning MMCSS off only made the audio stutter but not removing the lag spikes.
Tried turning Aero off / Using Windows Classic Theme.
When i disabled the audio in the device manager the lag spikes stopped.
The problems started when i upgraded to my new specs from a Intel Core 2 Quad Q8200 2,33GHz, on a Asus P5Q, P45, Socket-775, DDR2.
I would appreciate any help i can get.