USB NIC can't work properly!! Realtek 8150 chip.
 

I have got a usb NIC . The chip is rtl8150 , but when I plug-into a system -> Linux 2.6.5 (FC 2 release)
I got following errors:
usb4-2 : device not accepting address 4 ,error -71
usb4-2 : device not accepting address 5 ,error -75
Firstly , I guessed there may be some problems with my USB slot , so I tried with another slot.
But after 4 times (I have 4 slots), the errors appeared the same.
I manully insmod rtl8150.ko ... but nothing happened.

#lsmod
Module Size Used by
rtl8150 9476 0
floppy 47440 0
e100 25348 0
mii 3584 1 e100
uhci_hcd 23708 0
ehci_hcd 21896 0
......
(omit the other appears)

#ifconfig
eth0 Link encap:Ethernet HWaddr 00:07:E9:42:57:66
inet addr:172.17.51.4 Bcast:172.17.51.255 Mask:255.255.255.0
inet6 addr: fe80::207:e9ff:fe42:5766/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8594 errors:0 dropped:0 overruns:0 frame:0
TX packets:5395 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4587332 (4.3 Mb) TX bytes:677315 (661.4 Kb)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:298 errors:0 dropped:0 overruns:0 frame:0
TX packets:298 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:16214 (15.8 Kb) TX bytes:16214 (15.8 Kb)

Thanks in advanced!