Hey, welcome to Acid lounge.
I think this issue was recently dealt with on another forum:
Vladd44 wrote:
The problem stems from Vista's need to open hosts file with admin privileges.
A manual way to get the hosts file to work is:
1) Browse to Start -> All Programs -> Accessories
2) Right click "Notepad" and select "Run as administrator"
3) Click "Continue" on the UAC prompt
4) Click File -> Open
5) Browse to "C:\Windows\System32\Drivers\etc"
6) Change the file filter drop down box from "Text Documents (*.txt)" to "All Files (*.*)"
7) Select "hosts" and click "Open"
8) Go to
http://blocktards.com/updates/hosts9) Copy the contents of the page.
10) paste it into the notepad where you have the hosts file open.
11) Save and exit.
Let us know how you get on, if this doesnt work or you struggle with it, just post back, there are a couple of other options we can try.