xp Problmes

Okay I installed XP pro but my 5670 crashes after each level of BAttlefield 1942. I have the current drivers that came with the 5670: DirectX 9.0a and 128MB M9. I put the video settings to 16bit 1024 x 768 and it still crashes.
I am going to reinstall XP Pro again and see if it works better.................it hasn't worked better so I want to install Windows 2000 professional as my OS since BF1942, never crashed even at the highest resolution when I had Windows 1942. Since my hdd is partitioned, it has been a hassle for me.
XP is not my cup of tea for games anyways. So please someone post on how I can F/disk or reformat my HDD all over again and go back to Win2000 Professional. I loved that operating system

I have already backed up any files to the CDR and now just want to start over with 2000 profesional.
The sooner the better becasue I can't sleep tonight untill my 5670 stops CRASHING! Thanks in advance.