Hi,
the default path for the LO templates is
c:\Documents and Settings<user_profile>\Application Data\LibreOffice\4\user\template
This Example is for Windows XP.
If you have own templates they are located in the above shown template folder.
My suggestion is to delete the \4\ or whatever number in the path shown above.
Reason: If LO changes the main Version number from 4 to 5 or from 5 to 6 and so on you need to replace all your old templates you created in the old version.