I would not use either WET or MucAfee which is an atrocious AV that causes many problems. Replace it now with Microsoft Security Essentials.
As to WET it is easier and safer to sort your files into the User folders, then drag each to your backup device. The problem with WET is that it can fail and lose access to your files, and it also transfers AppData settings which are a corruption path into a new Install.
After copying to external, move it to target PC, in each of the User folders you saved click on Organize>Select All, then drag the group to the corresponding User folder on Explorer bar at left margin. Don't release them until it stops unfolding and the hypertext confirms the correct destination.
You can also follow these steps to Clean Up Factory Bloatware
which throttles Windows 7 performance.