System process high CPU usage

I have a problem with the SYSTEM process using a heavy amount of CPU resource. My PC runs at 100% usage constantly and oddly it does not slow down in use.

I have used procexp to get more details and it tells me that the thread responsible is TID 108 NDIS.sys+0x6b85. The stack thread is as follows
ntkrnlpa.exe!KiUnexpectedInterrupt+0xf0
NDIS.sys!NdisFreeToBlockPool+0x1617
ntkrnlpa.exe!PsRemoveCreateThreadNotifyRoutine+0x21e
ntkrnlpa.exe!KiDispatchInterrupt+0x5a2

Could anyone tell me what these do and why they would be using so much of my CPU?

If I kill the process using procexp CPU usage drops to normal and I do not notice anything not working.

Thanks
KecoKevAsked:
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Adam LeinssServer SpecialistCommented:
NDIS would point to your network drivers.  Have you tried updating those (wireless + wired)?
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KecoKevAuthor Commented:
Oops, sorry, I cannot kill the process, only suspend it.
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segurahCommented:
Disable the network card and see if it works.
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KecoKevAuthor Commented:
Thanks for pointing me in the right direction, the problem did indeed lay with my USB Wireless Adapter, an uninstall and download of new drivers provided the cure.
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