"Unable to obtain an IP address" error

My WD TV was working fine for awhile, but now I can only connect to my home network 1/10 times or so. I am sharing a hard drive from a Vista computer in my home. I’m wondering if I replace it with XP if my problems will go away.

I’m wondering if I should setup a manual network connection, but I’m not sure how to do that.

It’s very, very frustrating. Any help is appreciated.