If you could say what advice/instructions you were given it would be of some help.
But for now try this if you already haven't already
Go to search, type run, click on run icon, or just press windows+R keys to open run. Type C:\Users\insert your user name here\AppData\Local\Microsoft into run box, click OK. In folder that opens scroll down to windows live mail, right click, select properties then click on Previous Versions tab and select a previous version to when you know folders were not missing, either click restore, or you can copy to elswhere, then select just the folders you want and put them back into WLM.