You shouldn't really need to do anything in BIOS to make it work. should be able to put it in and boot up. You may want to verify which slots you should install which dims in (might need to put the 1gb sticks in certain slots and the 512mb sticks in the others). Check that and let us know if it works.
RAM can come with problems- so its worth checking with memtest to make sure they are all good sticks.
Timings are in the BIOS in the same area as you'd do overclocking. It should be near where you see your CPU clock speed and multiplier, you'll have RAM multiplier and speed and there should be somewhere near there referring to advanced settings or timings or something of that sort.
I have mmtest but am not sure how to run it.. I made a memtest startup disk but it doesnt work like it did the first time I tried to use it. I set the FSB to 166 and the other one to auto... thats how I got windows to work right but when I try to play W0W, the system reboots
make sure your BIOS is set to boot first from the CD driver or floppy (whichever you have your memtest startup disk on) and it should boot that and then you should be able to run a couple of times through and make sure all the RAM is good. Might also help to increase the RAM voltage a little.
tried the change the voltage a bit but it was more unstable until I put it back on normal voltage. running Memtest now for second time.. computer rebooted during first time dunno if it was BSOD or not screen changed too quickly
weird thing is that both the bios and windows task manager say all 3gbs of ram checked out okay
You can't rely on these measures. They mere tell you what amount of RAM is present, not that its functioning correctly. And not all RAM problems are static - many are somewhat sporadic. A single bit refusing to re-write 10% of the time can wreck some pretty decent havoc.
Run the tests and then we'll know where to go from there.