The problem being most likely, that you are using Avast and PC tools firewall and mozilla threatfire all at the same time.. Unmatched security or multiple security programs running at the same time can cause conflicts and assorted problems. One of the three probably blocking the updates from installing, because it thinks that someone is trying to hijack your operating system.
Important, Do a personal file backup, then:
Turn off the avast, threatfire and PC tools, then install your updates. What other security did you install?
Suggest you use a single all in one security application that has matched components, that do not conflict with each other, or conflict with the operating system file downloads.
But speaking of MS updates, you may have more trouble after installing them. Be prepared with backups of your personal files.
It's a good time to back up your personal files to DVD, CD or online backup service, before trying to install the updates as above.
If the updates still fail to install, it would be a good idea to do a system restore, set the drive back to the time before the problem started. If you need help with the system restore just ask here in the forum. System restore does not erase your personal files, and is reversible.