Windows Media Player and Windows Movie Maker crash when I try to play .avi file

[EllaIp]

Hello, I am using Windows 7 on PC which was bought 3 years ago.
Yesterday I installed Xvid codec and used VirtualDub to make a .avi video with xvid compression.
However, after I finished, I could not play the video on WMP or WMM.
Both WMP and WMM crashed.
How can I solve this?
Should I install some additional codec pack? Or should I reinstall WMP and WMM?
Many thanks!

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