Hello, and welcome to CrystalXP.net !
For the smiley packs, you can surely use them for Windows Live Messenger or Msn, In order to install these Smilies, First of all, you have to:
1- Download the file
2- Extract the contents of the .rar file(which are the smilies) wherever you want.
3- Open your msn messenger.
4- Open any conversation.
5- Click on the smiley button "
"
6- Click on Show all.
7- Click on Create.
8- Click on find image.
9- Go to the directory you just extracted the contents of the .rar file(which are the smilies in this case).
10- Choose the smiley you want, name it whatever you like.
11- Click on Ok.
12- Use the Smiley(ies) 
And about CrystalXP.net, i will give you some information as well.
-CrystalXP.net is a site where you can find almost anything to customize your pc. Weather you have WinXP, WinVista, MAC, or Even Linux.
-Otherwise, if you need help with something, Like if you're having problems installing a software or if you need help with doing something.. you just Create a new topic, in the Appropriate place !
-You can also Make some requests, weather you need a logo,wallpaper,icons,signature,avatar,web design or any other such things, you can also create a new topic(in the appropriate place as well), With as many informations you can provide, so that it can be easier for us to make your demanded request.
Before you post anything else,please read the Forum Rules.
Sincerely,
[C]radle.eXe