1. Go into "Settings", "Control Panel", "Memory" and select the "Virtual" tab.
2. Make certain "Extend virtual memory" is unchecked. If you receive an error message saying this is impossible, retry after closing all other applications on your tablet. If the error message persists, retry immediately after after shutting down and restarting your tablet without a charger connected.
3. With your tablet powered on, connect it via a USB cable to a Windows computer. Your tablet's internal memory card should appear as an available drive within Windows after a few moments.
4. Use Windows Explorer or some other means to determine the drive letter of your tablet's internal memory card.
5. In Windows, open the Start menu, select "Run..."
6. In the Run window that appears, type "cmd" and press enter.
7. In the DOS window that opens, type "chkdsk [drive letter]:" where [drive letter] is the drive letter of your tablet's internal memory card. Do not type the quotation marks. For example, if your tablet's internal memory card appears within Windows as drive "E", you would type "chkdsk e:".
8. Press enter. chkdsk will search for, and report upon, any errors with the filesystem on your tablet's internal memory card.
9. If chkdsk finds errors, you can attempt to repair them by running chkdsk again with a slightly different command. For this you'd use "chkdsk [drive letter]: /f" where [drive letter] is again the drive letter of your tablet's internal memory card. Do not type the quotation marks. For example, if your tablet's internal memory card appears within Windows as drive "E", you would type "chkdsk e: /f".
10. Regardless of whether or not chkdsk finds and repairs errors, please copy all your important files off your tablet's internal memory card to some backup location.
11. Safely disconnect your tablet from your Windows computer using the icon in the tray area of the Windows Start bar.
12. Disconnect the USB cable from your tablet.
13. Semi-optional: (You backed up all your files, right? Right?) Use the file manager on your tablet to reformat your internal memory card. chkdsk should have fixed all the problems with your card. Should have.

Your tablet's internal memory card is now repaired. However, if your tablet has been crashing frequently--and it sounds as though it has--then it may be a good idea to reflash. The crashes may have resulted in corrupt configuration files, etc. in other parts of your tablet and reflashing will correct that. Make sure you back important files up first though.