Anyway its no longer a problem, after getting all the new parts warranty replaced everything runs smooth as .... well just plain smooth.
XP loads in 23 seconds (h*ell yeah!!) (I did use Bootvis though). Most Far Cry maps load in under 40 seconds.
However the 8800 GTS KO I have seems to have a problem with AA. It cannot play Far Cry with 4 x AA even with everything else turned off... well the FPS goes sort of - 16-34 FPS in jungles (because the trees leaves must be AA'd). If I out it on 8 x AA - then boy - it goes down to 8 FPS. Dont forget Im not exactly gaming at high resolutions im gaming at 1280 x 1024.
So thanks everyone for your help especially Samm, but it wasnt an electrical problem it seems to have been a PSU problem (not electrical merley the power cables were loose at the PSU itself so the power fluctuated).
Well thanks and admin's you can close this thread now.