Vista - I can't manually configure IPv4 on vista

I'm getting trouble in configuring the IPv4 in Vista Home Premium 64bit.
It's on my new Toshiba laptop, and it has 64bit on it, instead 32bit installed on my old laptop. On 32bit, I got no prob in setting IPv4.
I've figured the trouble when I tried to transfer file via wireless ad hoc. I've set my 32bit's IPv4 configuration first, example 192.168.1.xx and etc...Then when I want to do that on 64bit, by Net Sharing Center->Wireless Network Connection Status->Properties, and I found that when I clicked on IPv4, the Properties button was turned light grey and I could only choose Install button on it.
I make them even, by looking my 64bit network detail and I set only my 32bit to have same configuration as my 64bit, and then they can connect and accessing their public folder. There is no problem on drivers and network device of my 64bit.

I don't know what to do, if I have to install some "whatever" it is called.
Does somebody know how to solve my problem so I can manually set IPv4 configuration?
Thanks before...

(danznokaze)