Thanks for the link, Richard...
So, the problem lies within the latest drivers....91.31....

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I remember I didn't have the problem with any of my previous drivers; the original ones supplied with the card, 77.77 and 78.01.
So, as the saying goes, "latest is not always best"....

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Cheers all...!
Paul...

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P.S.....News Flash...!
Woo-Hoo...

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Just downloaded and installed the nVidia program "slibaloon.exe", re-booted the computer, and lo and behold....
The dreaded balloon has finally burst...Joy....

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Many thanks again, Richard...
The sun has come out, and my life is now complete...

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LOL...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.