I wonder if you’d have better luck running the KAV removal tool from Windows Safe Mode.
Also, is your Shockwave Flash plug-in up to date? Current is 10.2.159.1. You can check it at https://www.mozilla.com/en-US/plugincheck/ and also http://www.adobe.com/software/flash/about/.
Disabling Flash hardware acceleration may help. When viewing a Flash antimation (there’s one at the second link above), right click and select Settings. A popup will appear, uncheck Enable hardware accereration. This is easily reversed, if it doesn’t help.