Hi Candyannie,
You may use your favorite search engine to look for any third-party websites which offers dx50 codecs.
Disclaimer: Using Third Party Software, including hardware drivers can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the use of Third Party Software can be solved. Using Third Party Software is at your own risk.
Hope this information helps. For any further Windows related assistance, feel free to contact us and we will be happy to help.