Windows Audio Device Graph Isolation CPU Gone Wild!

[palal]

Hi! I have a 3 year old Toshiba Satellite, 4 Gb RAM, 160 Gb HD, with Vista Home Premium, SP2 & updated. My issue is that at times the Windows Audio Device Graph Isolation {Internal Name: audioadg.exe } will use anywhere from a few CPUs all the way to almost 50%! And I would like suggestions on how to "TAME" it!
It seems to have no pattern, as some days I can play videos say from YouTube & as I have slow DSL lite it has to buffer, so I let it finish 1st before watching, & it's OK, while other times like now, as soon as I try to watch a video [even after buffering, running CCLeaner to get rid of junk, & Smart Ram to release MBs], it goes up to 40-50% CPU & everything grinds to a halt, as when combining all other processes at the time this will go all the way to 100% CPU!!! Stoppin the video brings the audioadg.exe back to anywhere from 15 to 30%. But that still is quite high. Other days after a video buffers, it may only stop to buffer a few times, but the audioadg.exe stays around 5-15% CPU. Priority: 8 - Normal [I couldn’t lower priority, it said access denied]
Here are some stats on audioadg.exe
File Version: 6.0.6000.16386 (vista_rtm.061101-2205)
Resources usage: CPU-0%, [it is temp suspended by anvir so I can work on other things] Memory-19 MB, Pagefile-18 MB, Disk-0 K/s
User Name: NT AUTHORITY\LOCAL SERVICE
Parent Process : 1404 - svchost.exe