mp3tag http://www.mp3tag.de/en/ is a free Windows program and a good way to fix tags.
Allow it to add itself to context menus–option while installing.
Under Tools/Options/Tag/Mpeg set Write to ID3v2.3 ISO-8859-1 and save that as the default.
When you have an album (as files in a folder) right-click the folder, choose mp3tag to open it. Highlight all the files. If you see anything in the Comment field change it to ,<blank.> option, which is at the top of dropdown menu, and Save tags. Bye-bye comments.
Make sure the files are in playing order from top to bottom, highlight them all, go to Tools–Auto-Numbering Wizard and choose Leading Zeroes and run it. That will make sure the Sansa can read your track numbers (01, 02, otherwise it would play 1, 11, 12, 13, 2, 21, 3, etc.–reads the first digit). It will also make the tags easily readable to the Sansa.
While the tags are highlighted, the cover will show up if it is inside the tag. If the cover is inside the tags, under View go to Extended. Highlight all the files again and click on the little floppy disc icon near the right side. That will copy the image as folder.jpg (or whatever its file extension is, .png, .bmp). Then click the X to get all the copies of the cover out of the tags. Saves space, makes the Clip run smoother–good news all around.
This sounds complicated but it takes about 30 seconds per album—that’s if you have to remove the cover art–and it is well worth the time. If you’re not dealing with Comments or inserted art, Auto-Numbering takes about 5 seconds or less.