Hi,
You need to toell us a little more about your system before we can help.
What OS you using?
Is this the first LAN card you have used in the system or are you replacing one?
Have you installed the card and drivers and then found it wont work?
And have you checked for IRQ conflict?

If you can answer these few questions Im sure we will be able to help you

__________________
Rig Specs: Custom Built:
ASUS M2N4-SLI
AMD Athlon 64 X2 Dual 4600+
512MB SLI NVIDIA GeForce 7950GT OC
2.00 GB Elixiur RAM
400GB Hitachi SATA II HDD
Western Digital 120GB IDE HDD
Samsung SyncMaster 932B Monitor
More to follow soon.....