If you use the built-in firewall on Windows Vista you are no more vulnerable
to them than you would be to any other computer on the Internet.
The question is whether you do or not. When Windows Vista popped up and
asked what kind of network you are on did you select "Home" or "Public"? If
you selected "Home" then your computer would enable services to your renters
that are not available to other computers on the Internet.
To find out how your comptuer is configured, right-click the little icon in
the bottom right that looks like two computers and a globe. Select "Network
and Sharing Center". At the top you see a picture with the name of your
network. If the picture has a park bench in it you selected "public" and
right below it would say "Public network." If it has a house you selected
"Home" and you are on a private network, and it would say "private network"
Since yours is not a private network you should change it if it is set to
public. To do that, click "Customize" in that screen and select public. That
will turn off sharing with other computers on the network.
If you use a third-party security product that includes a firewall none of
this works. In that case you need to refer to that vendor's documentation to
find out how they treat the local network.
Your question may already be answered in Windows Vista Security: http://www.amazon.com/gp/product/047...otectyourwi-20
> I share an internet connection with some renters in my house. I want to know
> whether there's any chance that they could hack into my computer through our
> shared internet and see some of the websites I've accessed. I've sent
> confidential information online (i.e. credit card info) and I don't want them
> (or anyone) to be able to see that.
> I've got windows vista, and updated anti-virus and spyware detector, but
> would I be more vulnerable to them considering we share an internet
> connection? Will they be able to see the websites I've been on?