My SanDisk Sansa registers an album on my PC, but they won't play in the player, help?

My MP3 player says that it has the recent albums that I had put on it when I look at my files with my PC, but when I try to go and play those files, the player doesn’t have them. It will take single songs and register it, but not a whole album. Is there a way to fix this? 

Edit your ID3 tags and/or verify that the tags are in the format that your player needs them to be in order to see them, ID3v2.3-8859-1. MP3Tag is a good (and free) dedicated tag editor. There are many, many threads/discussions of this on various boards of the forum here.