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 Many users who just recently bought Sam­sung Galaxy S2 I9100 struggling an issue when  tried to con­nect the phone to the PC to access the SD card though, and somehow it didn’t really work. An error message appears "Android MTP Failed!". Some few tips below might help you to the task and  man­aged to access the phone’s inter­nal SD card on  PC . Just ensure that you have already installed necessary drivers for your Samsung Galaxy S2 or install KIES on your PC.
Here's how,
-Enable usb debugging from Menu > Settings > Applications
-return to home screen
-plug usb cable in
-pull down status bar
-press ‘ connect usb storage’ button

or try this method:

Alternatively, without USB debugging enabled

Go to Settings > Wireless & Network > USB utilities and click the button > then (and ONLY then) plug in USB cable