Install Service Pack 1 for Windows 7.
How-To:
http://windows.microsoft.com/en-GB/windows7/install-windows-7-service-pack-1
http://windows.microsoft.com/en-GB/windows/service-packs-download#sptabs=win7
Upgrade Internet Explorer to the latest version via Windows Update, or link below:
http://www.microsoft.com/en-gb/download/details.aspx?id=40902
Check that Windows Updates are set to Automatically Update. You can review Optional updates, if required then install, else Ignore or Hide.
Apply a password on the Admin account. Optionally, restrict other non-essential users to a Standard User Account.
If you have available bandwidth / Internet usage allowance, you can Turn Off Smart Definitions in Norton. This will download Norton's full database. May be useful if the PC goes offline, but not necessarily required. - Just a thought mostly.
Unchecky to assist users and prevent unwanted toolbars or PUPs from installing.
http://unchecky.com
Google Chrome, Opera, Firefox are good alternate browsers.
Google Chrome comes with built-in features and security in mind. Including it's own PDF reader for viewing, saving and printing to PDF, Flash Player (
Pepperflash) for online videos and content. It also silently updates without interfering the user, and transfers all extensions and settings across to the new version seamlessly.
https://www.google.com/intl/en/chrome/browser/features.html
Mozilla Firefox, Opera and
possibly Internet Explorer(?) may be able to use PDF.js extension to view, save and print PDF files.
If you own a Microsoft account, you can use it's online file storage (starting 7GB), OneDrive for storing copies of your documents. Sensitive files shouldn't be stored online, unless encrypted. OneDrive is also available for download on Windows 7 SP1.
https://onedrive.live.com/about/en-us/download/