Find one of the video files in your shared folder. The default location is C:\Documents and Settings\"you account Name"\Shared. The easy way to find it is to start limewire and go to the library page, click on you shared folder and click the explore button. A window will open with your shared folder in it. Open up the folder.

Now right click a file and click on Properties > then click on "Change" > choose Windows Media Player from the list > click OK > Apply > OK.

That should change all the files of that type to WMP. Just repeat the process for any other files you want to change.

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If it ain't broke, fix it till it is!