Well, WinZip looks like the only thing there. Version 17 should be new enough to not cause problems.
Some other things in there that I would suspect: CCleaner has said point blank that it's not compatible with Windows 8 yet. Be very careful with using it, as others have had important fonts deleted, among other files.
PowerDVD might install a context menu as well, but i'm not sure.
Other potentials are VirtualBox, Adblock, and VLC.
I'm not saying any of those are causing the problem, i'm just saying that you should look at them as potential sources. If the problem persists, uninstall them. If the problem doesn't go away, you can reinstall them.