Windows Server 2008 R2 Drivers?

I recently installed windows server 2008 R2 but have come across driver issues, many drivers ,such as the graphics and wireless nic, are missing. I’ve tried downloading them straight from Dell’s website but they don’t support windows server 2008 OS. How can I get drivers for windows server 2008 R2?
My laptop is a dell studio 1537 (vista).