VLC and WinRAR appear here because you indicated it during installation. It can be easily disabled through application options or by reinstalling the application with more appropriate options.
For WinRAR, go to Options → Settings → Integration → Context menu items. Also note that WinRAR let you choose what items may appear, thus removing the less used "Compress and email" etc. stuff.
If I remember well, this is the same thing for Windows Media Player.
Probably Microsoft Security Essentials and Malwarebytes' Anti-Maware do have options too.
Tortoise SVN works from Explorer. So if you remove it from the context menu, you will not be able to use it any-longer. If you don't need it, uninstall it.
Modifying registry settings by yourself is not a good idea in this case. Sometimes, applications may recreate the registry keys (I think it is the case with WinRAR, but I'm not sure), or you can encounter unexpected behavior.
Most of the applications ask you if you want to create items in context menus. In this case, very often they enable you to change it through options. Some applications do not ask you anything and do not let you to disable anything: they are malware, and are good candidates for being definitively removed.