Jack, you know, you can edit your post if you have more to say. There should be an icon of a pencil and paper on your older posts, and you can add details by clicking this icon or clicking "Edit" in the top-right corner of your post. It is considered better etiquette.
And you DEFINITELY have enough space. It sounds like the problem, though, is you have Vista 64-bit and it is a 32-bit channel binary installer or .exe (one or the other). I don't know what to do about that, but someone certainly might.
As for advice on the game... Well, it is best to mix good and evil strategies, though you'll ultimately end up more evil most of the time. I prefer not to think of my alignment in terms of good and evil, so much as charming and tedious efficient. Build your towns quickly, or if you really are evil, just have them build a bunch of wonders to expand your influence, and then bomb the opposition with destructive miracles or charged artifacts. Otherwise, build your town up slowly over time by building houses as well--It is a good idea to still make wonders when possible, but also pay attention to the villagers' desires. The easiest ways to take over a village are either the kinda-evil, very efficient and productive way, which is to use whatever miracles you can, of course, while trying not to kill anyone, but smashing all the houses and scaring the population with fully-charged artifacts that you throw, which generate belief obscenely quickly, especially when thrown, and the very very evil and super-easy but far less productive way, which is to kill everything (slightly less wasteful to use wolves to do this instead of miracles that will also destroy the buildings), and then put a male and female missionary into the town and make them breeders--The town is now yours and you are starting to repopulate.
In the last land, it is going to be easiest to make chains of unbuilt village centers--Without any people building them, they will still have a tiny incluence ring for several minutes, plenty of time to take over a village or, as you will find very useful, move some singing stones that are protecting a Tibetan village without killing anybody or getting your creature zapped.
Lastly, if you go for city-building, focus on one or two cities or villages and just make them REALLY BIG, it is more efficient than making them all huge. And if your people start dropping in belief, bring an artifact from another town and toss it around a bit without smashing anything or killing anyone, or do some heal increase + bird miracles.