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Is it possible to edit files created by SWP including those formula?

Thanks

Hi, all:
I just installed Lyx 1.6 and I Click on VIEW-->DVI but it says
Error Loading TEX font metrics:
Font ecsl0800 (ecsl0800.{ofm,xfm,tfm})!

.....
There are many more missing.

What should I do?

By the way, I have Scientific Workplace installed on this computer also.

Thanks,