A .txt file means that it's text file that can usually be opened with Note Pad, txt files can't harbour a virus.
leli.txt file is just a file that Norton, typically, could not delete or gave as a false positive.
A txt file will never be found in system 32, but leli.txt may have left a trace in your registry.
I suggest that you download, install and run this free CCleaner tool. It has a registry cleaner.
CCleaner, formally called "Crap Cleaner" is a tool I use regularly to optimize my RAM
Moderator, Virus/Security Contributor