Time based blocking of messenger service

I'd like to be able to limit my 12 year old daughters use of MSN
messenger after 10pm, she has a PC in her bedroom and I occasionally
have found that she has been on the service way after " lights out ",
I dont mind her using the PC for homework and a little bit of " social
" chat but I'm looking for a way to turn off the internet acces at
10pm.

Its a windows XP pro PC on a home network ( belkin router F5D6230-3)..

Any suggestions gratefully received..

... Tony
.

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