Hi All!! Downloaded and installed this update. Think I have managed to get back 10% CPU cycles in Sonar. More info: Install this update to fix a situation where your Windows-based system that supports processor power management features, and is equipped with multiple processors, may experience decreased performance. URL for the download: http://www.microsoft.com/downloads/details.aspx?FamilyID=c2ab5a48-8240-4934-bbd8-34fb8a0fce3b&DisplayLang=en Regards, Phil Muir P J Muir Productions Music And Audio Production URL: www.philmuir.com/ Band website: www.steelstringmusic.co.uk/ Band my Space Site: www.myspace.com/steelstringmusic