Anything you need, you'll get a message if you don't have it and a suggestion to install it.Most people don't need Java. It's 'best' not to have it as the updater will run in the background, historically updates poorly/incompletely, and Java is the most commonly exploited Windows program.For the rest of the programs, just research their function to decide if you need them.I use Adobe Flash because I watch Flash videos online (youtube).
Flash is still much faster for me than the alternative, HTML5. You can read the FAQ to see if you need Adobe Shockwave (.I can't remember the last time I used Quicktime or Realplayer - and when I did, I used lightweight alternatives in Quicktime Lite and Real Alternative.
Step-by-step guide to help test if Adobe Flash Player is properly installed on your system. If it isn't, you'll find links to additional troubleshooting resources here.
VLC can take over for both standards, although the browser plugin is a work in progress.
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