Reset your player back to normal. Note that this will delete all files you have on your player, but it resets the player as if you just bought it. To do a safe reset, please make sure that your player is only a Sansa E250, not Sansa E250R. Here is the link that resets your player back to normal.
http://forums.sandisk.com/sansa/board/message?board.id=smc&thread.id=755
If you understand it carefully, you will have no problems. I recommend you read it one by one so that your player doesn't get bricked (kind of un-repairable) because the steps you followed were wrong.
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