ok not sure where to even put this but since it statred with a cpu upgrade id post it here i got a new intel9300 quad core and a ecs g31t-m mobo i got 2 gigs a ddr2 and a sata drive and a ide drive system runs great but my storage drives seem slow both ide and sata i looked for drivers but had no luck
recently I had a problem similar to you.
the solution was to see how the computer refers to the HD .
try switching so the Sata will bahave as IDE , and see if it solve something,
Vista has some problems with Sata HD.
i even switched hardrrives thinking it was a driver issues but its s still slow but oddly enough it may of been fixed when i added a real video card which sucks i liked thew onboard card i dont game i liked it running cheap