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1.Are you able to connect/sync other USB devices?

I would suggest you to follow the steps provided and later update us on the status of the issue.

Method 1: Try to run the hardware troubleshooter and check what the issue is and fix it accordingly.

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Follow the link given below open hardware troubleshooter.

Method 2: If the issue persists then I would suggest you to uninstall and reinstall the Kies software for the Galaxy S-II from Samsung’s website and check if it helps.

Method 3: Uninstall the driver from Device Manager and scan for new hardware to install the driver again.
Here is how:

First, please disconnect all USB devices and then perform the following steps:
a) Click 'Start' button, type “devmgmt.msc” (without quotation marks) in the “Search” bar and press 'Enter'. Click “Continue” if necessary.
b) In Device Manager, double click to expand 'Universal Serial Bus controllers', right click on the Host Controller, click 'Uninstall' and click 'OK'.
c) Repeat the step 2 to uninstall all items under 'Universal Serial Bus controllers'.

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Then, restart your computer and Windows 7 will reinstall all USB controllers automatically.

Galaxy S2 Mtp Usb Driver Download Windows 7

Refer:
http://windows.microsoft.com/en-US/windows7/Update-a-driver-for-hardware-that-isnt-working-properly

For any Windows related issues please feel free to contact us and we will be glad to help.