Your images are not displaying, not surprising since they simply point to the tinypic upload page.
Avast has a self defence module. It can be accessed bym right clicking on the tray icon, opening the main interface, click on "settings" at the top right, then "troubleshooting" from the menu, and removing the tick beside "enable Avast self-defence module".
After that it can be uninstalled normally. The tool can then be run.
In your situation, Asyns' advice is good. Reboot into safe and run the tool.
Next AV you get, I suggest a rummage through the help files before doing too much. This sort of info is not hard to find in Avasts' help file.