Hi! today I uninstall my revit 2013, to fix some problems I had, so before that I exported my license with the LTU. The problem came, when I reinstalled the program and tried to use the LTU to import the license. It showed me a message saying there was an "error 41"
I dont know why did that happend, because when I uploaded my license it was successufylly made.
The LTU is often problematic. I would recommend simply trying to activate the license again on your new computer. You might have better luck. If it won't activate, you can contact Autodesk Activations for help.
You can use the online method to activate your license here:
http://usa.autodesk.com/adsk/servlet/pc/item?id=18424632&siteID=123112