I cannot format the WD 3Tb hdd

The BIOS and Vista see only 764Gb.

How should I convert to GPT?

I’ve understood that the PCI card is used only if you want to make the disk bootable and only on W7 or Vista 64bit. Otherwise, if you want to use the disk as secondary drive under W7 or Vista it should work without the PCI card. There is still an issue with some Intel chipsets which might need a driver to cope with 3Tb.

Please advice on the GPt issue, how could I force Vista to format it with GPT instead of MBR?  And, as the BIOS sees it on 764Gb how could I expect Vista to see more?