Now i will tell you how to fix usb flash drive/memory card:
The symptom:
1. usb flash drive/memory card detected by windows.
2. error message appear "The disk is not formatted"
3. When you try to format it and then error message appear "Windows couldn't complete formatting the disk...." or similar.

Don't throw your usb flash drive/memory card, try this step:

• 1. Start your windows in safe mode. Want to know how?? check this link

....Windows safe mode....

• press the windows key+ R letter it will show run...


• type compmgmt.msc, and then click OK


• In the console tree, click Disk Management. The Disk Management window appears. Your disks and volumes appear in a graphical view and list view. To customize how you view your disks and volumes in the upper and lower panes of the window, point to Top or Bottom on the View menu, and then click the view that you want to use.


• After that In the Disk Management window, right-click the partition or logical drive that you want to format (or reformat), and then click Format.


• In the Format dialog box, type a name for the volume in the Volume label box. This is an optional step.


• Click the FAT 32 file system.


• Click OK.


• Click OK when you are prompted to format the volume. The format process starts.

If you still cant format your partition, the best step is use your other OS such as Linux, Mac, etc. Format your usb flash drive/memory card.
After you complete the format please clean your windows computer with antivirus. Because your computer might get infected but your usb flash drive/memory card are OK now.