Windows 7 Unable to setup network parameters

[Warluck]

Hi, I have a weird problem with Windows7 under "Local Network Properties".

I can't change IP adress because when I choose TCP/IPV4 the "Properties" button is unaccessible.

I tried disabling IPV6 and reboot but nothing changed.

Windows Version is :
Version 6.1.7600 Numéro 7600

The PC is a VAIO notebook with an Intel PRO/100 network integrated lan device.

Thanks in advance for any help you can provide.