1. Chuck a folder on your C drive and call it "My share" or something equally recognizable.
2. Right click said folder, hit properties and navigate to the "sharing" tab.
3. Select 'share'.
4. In the window that pops up click the drop down arrow.
5. Select 'everyone' and click add. It will add the 'everyone' group below and grant them read/right permissions. Sweet!
6. Now is a good time to open my computer, go to network (on the right hand pane) and just be sure that a little prompt doesn't come up asking if you'd like to turn network discovery to on. If this prompt does appear, go ahead and turn network discovery on.
The folder and any contents you place in it will now be view able over your network. (So chuck WoW in it!) After that you can hop onto your laptop, go to start > computer, and select network from the right hand pane. After a few moments it will display your desktop there under whatever you've named it. Open it up and you will be asked to login. You'll need to enter the username and password of the user account you use on your desktop. Once you've successfully logged in you'll see the "My share" folder you created. Open that and there's WoW
Go ahead and copy paste it to wherever you like.
I'm assuming both PC's have windows 7 on them of course. Should probably have written that first but I cbf'd editing it now ^_^ god luck!