Hi i have found x2y the easy image converter it's pretty quick at converting tga files to dds. Link below if anyone wants it.
https://www.google.co.uk/url?q=http://x2y.sourceforge.net/&sa=U&ved=0ahUKEwjjo-Tsj6PRAhVFbBoKHXOCB4EQFggbMAA&usg=AFQjCNG4mawVTtDTPenwJedi1b_0-dovHQ