AutoCAD Lt 2013 Linetpyes cannot be removed

[Anonymous]

I am having an issue with line types.  I have about a dozen lines types that are coming up in my drawings, they are not being used by a single layer or object in the entire file, but they cannot be purged from the file, nor deleted by the  Linetype Manager.  How can I remove these line types from either of the files that they are appear in.  They have infected my template files.  TO make matter worse I cannot copy ANYTHING from the infected files into a new drawing because these linetypes will be carried into the new drawing.  For some dumb reason I cannot attach a .dwg file to this message to provide an example.

[Charles_Shade]

Welcome to the Autodesk Forums!

Yes it is an issue attaching DWG files; has been for a while. Try to Zip it and then post.

Have you tried QSELECT, Linetype and then ERASE?

How about WBLOCK to a new file?

Did you download any vertical or 3D content like Blocks or Manufacturer drawings?

[Anonymous]

I had the same issue for 12 LT. The only way i was able to get rid of it was to re-install. I had to wipe my autodesk directory then fresh install.