Problems with 2 gb sandisk memory card- contents could b accessed

problems with 2 gb sandisk memory card. even if the contents are there in the memory card it is not showing the content. it shows 1.1 gb of content, but wen v click into the memory card its showin empty. i am using it for nokia 5130 express mobile. bought only yesterday. and also even if v enter sum contents its getting corrupted both picture and music contents in a very shortwhile. if v enter the folder name say "FUN" and put some contents into it and store it in memory card ,in a shortwhile the folder name becomes like "FUN~". for all folder whichever v save in memory card in a shortwhile it changes into"FOLDERNAME~". Also the contents couldnt be accessed. Pls help me in rectifying this asap.

Thanking You,
R.Saravana Kumar