How can I delete things that show up on my mp3 but not on my computer?

What happens when it won't recognize that you have a playlist?

You probably have your Windows Media Player set up for AUTOMATIC instead of MANUAL synchronization. When this option is selected,Windows Media Player will add EVERY song, picture, etc from your Library on your computer to the GoGear. Now, every time you sync you device, it adds every new file from your computer into the GoGear automatically.

Here's what you want to do (this process assumes you have Windows Media Player 11 and windows XP - if you have another version, just let me know and I will give you modified instructions - reply to the FixYa website, not to my personal e-mail address):
1) Backup all files stored on your GoGear, as this process will delete all files from your GoGear
2) Go into Windows Media Player 11 with your GoGear connected to the computer (it will automatically sync and add new files one last time), move the mouse cursor over to the sync tab; a small black arrow will appear under the word "Sync"; click on the small black arrow and a dropdown menu will appear; select "Portable media device" from the dropdown menu, and another dropdown menu will appear; select "Set Up sync"; a window will appear with some information on your device - uncheck the box that says "Sync this device automatically"; click Finish; This will eliminate the problem of Windows always adding songs/files you don't want into your player.

As for some files not being viewable, try simply disconnecting the GoGear from the computer and resyncing with Windows Media Player. sometimes files will be displayed multiple times, and a simple resyncing will cure the problem. Otherwise:
You must use Windows Media Player to delete songs from the GoGear. With your GoGear connected to the PC, you want to highlight (single left click) the icon of the GoGear (or line that says Philips GoGear blah blah blah) on the left hand side of Windows Media Player 11 - this will ensure that you are deleting files from the GoGear itself, and not the computer. Once the GoGear line is highlighted, click on the "Songs" or "Album" folder underneath the GoGear line (NOT the "Songs" or "Album" folder underneath the "Library"). This will bring up a list of songs stored on the GoGear into the middle pane of Windows Media Player 11. Highlight (single left click) a song you want to delete and press the delete button on your computer's keyboard. windows USUALLY gives you a prompt asking if you really want to delete the files/they will be permanently removed from your (GoGear) device. Congratulations, you have just deleted songs from your GoGear! :-)

-Tha Mp3 Doctor