I have an old Dell Dimension XPS T550 and I want to format it and all of my cd installer was gone. Anybody know where can i download my motherboard driver?

Here are my specs:
Board: Intel Corporation SE440BX-3 AA722396-108
Serial Number: 0007335T1246197B01FV
Bus Clock: 100 megahertz
BIOS: Intel Corp. A11 10/13/2000

I looked it at the internet mostly in DELL.com referring to my service tag (R3BQ7) but no available download. I found Intel SE440BX. Is this the same to Intel SE440BX-3? Any help?....tnx