I would suggest you to either contact your computer manufacturer or
borrow Windows 7 installation disc with any of your friend or neighbour to perform in-place upgrade of your operating system.
Note: Ensure that you back up all your data before you begin the installation.
Refer to the link to backup files on the larger drive before installing the operating system:
How to Perform an In-Place Upgrade on Windows Vista, Windows 7, Windows Server 2008 & Windows Server 2008 R2
Note Performing a repair installation will not damage files and applications that are currently installed on your computer.
Reply to the post with updated status of the issue to assist you further.
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