You can do a full system back up so when you install the new Windows 7 you can unpack the files to make it look like nothing has changed.

Go to My Computer > Control Panel > System and Security > and under "Back up and Restore" select the option "Back up your computer" its easy steps from then on. Once you have your new OS installed go back to system and security and simply click restore files from back up, then just navigate to where you've backed up your files and let it unpack.

Hope this helps.

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