Hey guys! I'm a newbie. I was doing some work on my Dell laptop today, trying to get things cleaned up and moving a bit more quickly. I realized like I have about 15 bajillion media players, and I don't know why or which ones I need. I don't know if they're all the same or if they serve different functions, so I'll just throw some out there, and if you guys could give me some advice on what to keep and what I can safely dispose of, I'd appreciate it tons!

iTunes - what I use primarily
Creative MediaSource 5 - I opened this for the first time about 5 minutes ago, and I've had my laptop for almost 2 years.
Dell MediaDirect
RealPlayer
Roxio... - There's about 10 Roxio programs in the list.
Sopcast
VLC - I use this instead of Windows Media
Windows Media Player, obviously. Don't think there's much I can do about that.
Windows Media Center? wtf?
Viewpoint Media Player - I use AIM, so I have to keep this, right?
Quicktime Player

Then there's things that I assume I have to keep but have no idea what they are. They just sound sort of media-related.
SigmaTel Audio
Sound Blaster Audigy
ATI Catalyst Control Center Ex