Get Yahoo Messenger Now

plz i want an effective way of disabling these two websites i.e messenger.yahoo.com and yahoomessenger.com becoz my sister spends lots of time chatting,i had tried disabling it using the internet options but it doesnt work,plz,is there any parental control that i can download for free?
i expected you to answer my question rather than asking me more questions.anyways,how about the fact that she’s leaving in my own house using my own computer?u hav a prblm with that?

hi!
i am having this problem for a long time, thats why i quited yahoo messenger, but now i have to use it. so here is the problem. i download the messenger from yahoo messenger site. install it. then when i click on the shortcut, nothing happens. i open the task bar, i see that the moment i clicked on the program file, the cpu usage goes up to 100% but then instantly decreases to normal level, but the program doesn’t start, and YahooMessenger.exe is not listed in the running programs. i tried to install-unistall the program couple of times, i tried versions 6-7-8. i even reformatted my harddrive and installed windows again. but nothing worked. I use a Dell 700m laptop, Win XP Pro SP2 operating system. all the help is appreciated.

When I am using my mobile phone Sony Erricsson K800i for intrnet connection YM works fine.But when I am using wireless netwok it just doesnt log in to ym, where as I can use Skype with this wireless network.Other web sites also works well in this wireless network.