Remove Network / Block User

I live in an apartment complex on a college campus. We
have an ethernet connection with all the other
buildings. I have never set up a network or workgroup,
but recently there is another user accessing my
computer. I have nothing shared, and they are constantly
on my computer. I get the warning message when I shut
down or put it to sleep that another user is on. I am
very nervous about this and want to block my computer
from this user. Please help me. Thanks.

Install a firewall.

"aj" <(E-Mail Removed)> wrote in message
news:f22e01c3f111$e2e48130$(E-Mail Removed)...
> I live in an apartment complex on a college campus. We
> have an ethernet connection with all the other
> buildings. I have never set up a network or workgroup,
> but recently there is another user accessing my
> computer. I have nothing shared, and they are constantly
> on my computer. I get the warning message when I shut
> down or put it to sleep that another user is on. I am
> very nervous about this and want to block my computer
> from this user. Please help me. Thanks.