Ntkrnlpa.exe 50% cpu when idle - Vista

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Hi
Running vista business on dual core D 2.8ghz on intel Dp965lt.
The output of dumps is on my website but I can't post links (!)
See aranrock.dyndns.info/temp/ebay/ for all the dumps referenced below.
sys.txt shows sytem configuration in the above link


My CPU is running at about 50% when nothing is running and I can't figure out why.
When I start up the system (before even logging in) I can hear the fans start up as a result of the increase in CPU.
When I run Process Explorer and look at the 'System Idle Process'
it shows two threads both belonging to ntkrnlpa.exe with a start address of ntkrnlpa.exe!KiIdleLoop.
Each of these take up 30 and 24% CPU respectively.
See the image of this pe.jpg at the site link above

Any ideas?
I thought it might have been my intel gigabit nic so I updated the driver on that (it was previously taking up 100% cpu on occassion).
I also disabled the nic for a while to see if that made a difference (after reading some of these posts)

MiniDump
Also when I shut down I get BSOD. I ran the debugging tool on the minidump in windows and it says I have Driver power state failure. See the minidump minidump.txt in the above directory

When I run Kernel rate it shows ntkrnlpa.exe near the top.
See the text report ker.txt

I also ran SFC and it said it found some corrupt files but when I look at the log it generates it says all have been fixed.
See cbs.txt in the directory above

I'm not a systems expert so pls go easy on the tech instructions.
Thanks in advance

CB
 
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