Micro Sd Drivers not working?

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Okay... I am stumped. Someone please tell me why my computer all of a sudden says that the drivers need to be installed for my micro SD card. I tried to and it says it cannot locate it, and to insert the disk that it came with??? It did not come with a disk! I have went to several websites trying to find these drivers and I have been unsuccessful. My computer runs on Vista. Anyone else have this problem? If so, how can I fix it?