100Mbit Lan runs at sloow 417Kbs!!

[Adamo <im2sexy4you@gmail.com>]

Hi i had windows on this box before and the speed was above 3000Kbs i
installed debian and now its a slow 417kbs.
im running sarge with kernel 2.6.8 on a 800Mhz 512ram machine and
minimal amount of services, there is plenty of cpu left so thats not
the problem.
its a asus av7 motherboard and the netcard is a Realtek Semiconductor
Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) card.
my switch is 100Mbits.
Ok got any ideas?
Im desperate!
heres som output

Output fra mii-tool:
eth0: negotiated 100baseTx-FD, link ok
 product info: vendor 00:00:00, model 0 rev 0
 basic mode:   autonegotiation enabled
 basic status: autonegotiation complete, link ok
 capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
 advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
 link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

output from ifconfig:
eth0      Link encap:Ethernet  HWaddr 00:C0:26:78:14:A1
         inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:599881 errors:0 dropped:0 overruns:0 frame:0
         TX packets:795532 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:173192384 (165.1 MiB)  TX bytes:842761893 (803.7 MiB)
         Interrupt:3 Base address:0x7000