How to switch my Atheros AR8151 network adapter to 1G speed

Hi,
I have an Alienware 17x3 with an Atheros AR8151 PCI-E Gigabit Ethernet Controller (NDIS 6.20). Since a reinstall of my laptop I can't get my network up to 1G anymore. The connection is always 100M.
I already tried several drivers but no luck.
Can someone help me pls?
Thanks in advance
Kind Regards
Filips Houbrechts

Hi IEEE488,
Thanks for the link. In the meantime My PC is re-installed about a month ago and all my software is in place already. All of the mentioned drivers are already installed but maybe not in the right order.
What do you suggest in this case?
Thanks in advance
Kind Regards

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