Restricting internet access

How long is a piece of string? No, seriously.

You don't say if it is standalone or networked. If the latter whether it is a domain or peer to peer. However, there are products available from one off fees through to annual subscriptions and these can be anything from the 10's of ?'s through to many thousands.

For example we currently use Secure Computings SmartFilter but I am currently reviewing Cobion Orange Box (I like) and SurfControls Web Filter (I like a lot). But as to whether they do what you want remains open to question unless you rephrase your question.

Hope this helps a bit :)

Stub.