Help!!! help!!! help
Don't be too impatient. You're dealing with a public forum where people pop in to help when they find the time, and live in different timezones around the world. It can sometimes take a day or three to get a response.
Personally, I would guess that you simply
can't use Visio unless it's installed. But perhaps there is a "Visio viewer" similar to the Powerpoint viewer, or something.
However, keep in mind I'm not expert in that area and may be overlooking something obvious.
P.S. I deleted your earlier "hurry up" message, because a lot of the time, people will go looking for questions that don't yet have a reply. Now that this one does, they might miss it. (That's also why I didn't bother to reply, since I didn't have a definite answer for you.)