Originally Posted by
willyroo
I'm now almost certain the problem is the MS wireless keyboard and mouse. Will try a wired version of both tonight...and if that doesn't work it would appear (sigh) a fresh Win 7 format and installation required...
The problem was the MS Wireless keyboard and mouse. Gone from 16,000+ µs when using the keyboard or the mouse to a maximum of 854 µs, which occurred when I opened Thunderbird - which is a bit resource hungry - while streaming iTunes.
Bugger...