Since you have a valid subscription, you are entitled to a free update to Norton 360 Premier edition version 3, which I highly encourage you to do after you have updated Windows and Norton and completed the "Comprehensive Scan."
Please NOTE, that while this process will update you to the latest version of Norton 360, it will not extend your current subscription. To update to Norton 360 Premier Edition version 3, please visit the Norton Update center at the link below.
Norton Update Center
When the installation of the updated version is complete, launch Norton 360 version 3, mouse-over the "PC Security" bubble and choose "Check for Updates" so that you get the latest product and definition files applied to your installation. If any updates are installed, restart your computer.
As to the issue you are having with Word documents, you can disable the scanning of Word documents and still be protected, as long as the core "Auto-Protect" engine and the other advanced features are enabled. As soon as a Word file is written to disk, the real-time scanning will check the file and you should not notice any slowness. To disable the scanning of Office documents, open Norton 360 and select the "Settings" link art the top of the window. Next, select the "AntiVirus" icon and then select the "Scans & Risks" tab at the top. Locate the "Microsoft Office Automatic Scan" option and disable it. Click the "Apply" button.
Let me know if you have any further questions.
Norton Authorized Support Team