Blocking wireless access to single comp on router.

I was wondering if there is a way to basically turn off my daughters web access at a set time each night ? If possable i would like to put some parental content guards on it as well (she's 15 ) Also it would be nice to stop my pc slowing to a crawl when she is online as i think she may be getting most of the bandwidth.
I am running with a standard SKY netgear Router and as such i guess these things would need to be done at a software level on her PC.
Any sugestions as to a set of apps or a program that will do this ?

Thanks
Mactronix

The Router box says it a Netgear DG934G-1SKUKS As i said standard issue from SKY.

I guess there could be a way to configure her wireless adapter to a lower speed ?

I will put the Model into the link you provided and see what comes up.
The Trafic shaping search seem sintent on Networking solutions which would mean the connection had to run through my PC first ? Which if thats right isnt happening, she has total wireless access.

Mactronix

Tech-speak, everything is a computer. Router is too. Just missing a harddisk/optical disk. The DD-WRT is a router firmware that runs on a compatible router.

5.4Mbps is still too fast unless she pays for the bill. 50-100Kbps down is more like it. It feels like dial-up. That's the point. Makes the user not sit around all day on the computer.