ya so my limewire player will not work, i click launch and nothing happens, i have version limewire 4.12.6 pro can someone help me fix this problem??

The LW player is really horrible, I'd suggest you make something else your default player

But...if you definitely want to use the LW player, try this: Delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.

i tryed that , it still didn't work

The LW media player can be very slow to work. So wait a few mins if necessary. Though it shouldn't take that long. LW's primary purpose is downloading & uploading so that's where the majority of the cpu is targeted at. The media player gets a lower priority & thus can be slow to work. Try using the media player after you open LW & have waited for the library to load, without downloading anything & see if it works then. If it works, then it will work when you are downloading but remember to be patient for it to start playing.