The card is broken. Buy a new one.
No.
take out the SD put it in your computer,then format it there.
I hope you don't have the card in it, The computer does not see the holder, only the card. I don't know if your PC has a sd card slot, or your using a reader. But if you have the micro card in the card holder and you put it in the PC or a reader and it does not see the micro card, the reader, card holder, or micro card could be bad. Did you format the card, if you formatted the card with windows and used the wrong format, you killed it, and its no good. If you use any card,sd, mini,micro, in anything such as a cell phone or anything like this, you use the devise to format the card, never use windows to format the card. If you want, you just erase the card , that is, you delete the files off the card, DO NOT FORMAT the card just to remove what is on it. So, the computer does not see a holder, a reader, it only see's the card when it is in a holder or a reader. To answer your main question.
Try system restore and it it fails to resolve the issue format the sd card.
First, get a Micro SD to SD adapter. Next, get an SD card reader. Put the Micro SD card in the adapter, and put the adapter in the card reader. Now, connect the card reader to your computer and take the data off the card. Once the data is off the card, put the Micro SD card back in your phone, and format the card. Put the Micro SD card back in the adapter, and put the data back on the card.
if does not formatted.. use digital object rescue pro.. to repair a memory card.. or use windows 7 to format the memory card..
If it's asking to format it, then it is almost certainly corrupt and unviewable without getting a costly specialist to have a look at it.
To transfer files from a CF card to a micro SD card, you can use a card reader that supports both card types. Insert the CF card into the card reader and connect it to your computer. Copy the files from the CF card to your computer, then remove the CF card and insert the micro SD card. Copy the files from your computer to the micro SD card.
If the SD card can fit into the two things, you shouldn't need to format or delete anything. You should be able to move it between the two and keep all the same pictures.
Most memory cards are sold empty so there is no need to format the card
micro sd memory card unble to format software download
yes just put ur microsd card on ur reader (USB,etc) then go to my computer>right click on ur micro sd card and click format > press ok.