ADSL sharing Problem..HELP..?

HI
I Got a problem with my ADSL connection at home. I got 4 (WinXP Pro) PC
using Hub to network & share the ADSL connection . The problem is when we
share the internet . The Host PC is working probable but the Client PC got
some page or site (hotmail , the-sun.com.hk) can’t see the page …I mean is
always “LOADING”
Isn’t it the Firewall or Local area network proble…?
Can any one can fix the problem for me.?
Thank You
Kurt