ok so i fitted new OCZ PSU 600W.........removed CPU cooler...cleaned and re- thermopasted it.........downloaded new graphics drivers.
pc is now running miles better..like it once was, played Fallout 3, it crashed only once; but not like before, this time the screen froze and i just hit ctrl, alt, delete...and i was back into windows........... but it's always been like a power cut before.
pc doesn't make surging noise any more.........fans/hard drive are constant, it feels more powerful.
VEGAS 2 gave me a few problems at first in the menu area...mouse was not responding quick enough and lagging like crazy........ but after 2 shutdowns it's ok now...
fear 2/ steam......fine, running perfectly.
Fallout 3 also looked better and ran smoother, it crashed after i loaded a saved game...Dogmeat was killed by Death Claws

.... this is a normal F3 bug.
CPU is 43 and 47 degrees under load........ card is about 31, mobo about 28....that's not bad considering it's so hot!
it's not overheating, i think the faults were :-....a seriously ****** PSU and old drivers, about a year old.
i've backed off the overclocking, the 8800 GT is now running at:-
715 core.......1787 shader.......1072.......memory, let me know if this is ok or if i can go higher
thanks