There are some
special instructions to be able to open EPS files on windows, but that should not prevent you from saving as EPS. I've even saved as EPS without having Ghostscirpt installed. But I can't open it to look at it.
Are you able to view the EPS file, to determine that it looks like you want, before you import to EXcel? Have you saved an SVG version? I don't know if it will help, but maybe if we could see the SVG version, it might give us a clue.
For example, does that "garbage" dispaly problem only affect certain parts of the drawing? Or does it affect everything. I saw some bug reports involving pattern fills and gradients, but without being able to ssee the image, it's hard to guess.
Can you post an SVG version for us?