Sometimes when you insert sd card into a card reader, the card reader will not always work, I have had problems like this, so either try another USB port on the computer, or clean the contacts on both sd card & card reader.
Basically, you plug in the device (camera) and you should get a popup asking what you want to do, such as import photos and videos. Here's a link with more inrmation:
http://www.pcadvisor.co.uk/how-to/google-android/3417027/how-transfer-music-files-android-smartphones-tablets/
See this thread about updating the Android OS, etc.:
https://forums.lenovo.com/t5/Other-Android-based-Tablets/Installing-Adobe-Flash-Player-on-Lenovo-A1-07-Tablet/td-p/915985
You did not say which tablet you have. For Ideatab Android tablet, start with battery fully charged and tablet OFF. Press and hold Volume Up and Power at the same time until menu appears on screen. To navigate the menu, use Volume Down to move through the menu choices, Volume Up to select the current menu choice (like an Enter key) and Power button to return to previous menu. On the "Factory Menu", move down to "Clear eMMC" and select that option. You should see a message that data is being cleared. This may take several minutes to complete. Wait for it. When it completes, the tablet should be reset to the way it came from the factory so you will have to set up again user ids, wifi passwords, download apps, etc.
download mobogenie
from given link for computer
Mobogenie logo
then connect you tablet with USB in on condition
and wait until the drivers get download
and then after that your tablet get open Automatically
2nd Method
watch this video your proble will be solve but this method cos you data which you collect and attched to your tablet inbuilt memory
