Doug
Your problems are most likely the result of malware damage. We have identified two sets of damaged files but there could be others. You could try a Repair Install but a clean install would be better to ensure complete eradication of any remaining undetected malware.
A clean install involves formatting of the disk at the beginning of the installation process. Writing zeros to a drive is used to stop deleted information from being read after a disk has been formatted. You do not need to go to that extreme.
You need to plan your new installation. Do you have a disk to install the motherboard and other third party drivers? When your computer is up and running install anti-virus protection and then get updated motherboard drivers. Don't download all Windows Updates in one go. Download batches manually,. This enables you to manage the updating process and more easily handle any problems arising.
Backing up and restoring data is an easy thing to remember. Less obvious is the need to make sure you have all your favourites and web address for programmes you want to reinstall. Don't forget user names and password for sites you log into. Also make sure you have all Product keys to reactivate Windows 7 and programmes to be reinstalled.
Clean Install
http://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html
Repair Install
http://www.sevenforums.com/tutorials/3413-repair-install.html