Latitude d420 bluetooth issue

hi everyone, i hope someone has a solution for my problem because i cant find it anywhere. i have a dell latitude d420 that is upgraded to windows 7. I bought a dell trumoblie rd530 350 bluetooth 2.0 wireless module for it because it said it was compatible. On the BIOS page, the bluetooth is enabled,but the light stays on and the computer cant find the driver. i would download the driver from dell but every time the one that i downloaded just goes to the blue screen upon install. please help me find the right driver