It is possible Win 7 does not like the RAM that is installed. Some RAM set ups ran without problems on XP but would bin when running Win 7. If you have some other RAM modules try them out.
ive got one stick of ddr400@512mb but im pretty sure windows 7 needs more than that to function, i'll pull a couple of sticks out of the pc i sold my mate in the morning, im sure he wont mind
thanks for the responses people i just want my computer back