Windows 7 Plagued with constant audio noise

I often record programmes from on-line radio but they are marred with constant audio noises in the background consisting of pops, clicks crackles and whistles. It seems to be worse when there's processor and network activity (like when recording) and appears to change when the display changes (noisier when the more detail there is on the screen). E.g. if you open a folder the sound goes kkkkk as the folder opens. I've tried to update the drivers but Device Manger says they're the most up to date available. I've also tried different power saving settings and disabled the processor throttling, some help a fraction but the noise is always there. I even tried disconnecting the mains earth to try and eliminate any earth loops but it made no difference. I did a latency check on the drivers and although it's high on ndis.sys, disabling the network adapter to eliminate the problem means I can no longer record anything (and with the adapter disabled there's still noise on the audio). Can anyone advise please as I'm nearly bald with all the hair tearing.


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