Excessive buffering is the result of poor connectivity. Streaming video is especially susceptible to congestion-related problems. You may be able to improve playback quality by making some buffering changes within your player:

• Click View, located on the Windows Media Player toolbar.
• Select Options from the drop-down menu.
• Click the Advanced tab.
• Select the Streaming Media (Windows Media) option by clicking on it once.
• Click the Change... button.
• At the top, under the Buffering section, select the second option, Buffer, and enter 15 in the box.
• Click OK.