H420 Network Speed Stuck at 100mps on 1gps network

[BigBillT]

I have a Lenovo H420 with a 1gbs network card.  I believe the NIC is an Intel 82579v.  I am using Windows 7 Ultimate x86.  I have not updated anything other than the operating system.  I did this insure compatibility with some equipment that doesn't support Windows 64 bit system.

My H420 will only operate at 100mps.  All my other computers on the network operate at 1gps, with the exception of this one.

How can I fix this?

[MrPeter1985 Guru]

Have you checked in the Network Cards settings and tried forcing it to run 1GB Full Duplex?

Also an old or slow Cat cable can do this to. Try a different cable out and see.

Best speed on gigabit can be reached with CAT5e and/or CAT6.

Hope this helps.