Before I quit, I was playing the old Windlight viewer, or the one shortly after it. Anyway, when I go somewhere, prims, textures, worlds and characters do not finish rezzing all the way. This results in low-resolution images that aren't finished loading, and prims that are often just their component boxes.
It's still doing this

HOWEVER, whenever I alt-click something to look at it, it will rez completely, from characters to objects.
My computer specs (yeah I need to upgrade eventually.. but in the meantime)
Athlon 2.0 Ghz Barton 2600+
GeForce 6800 GT
2 GB Corsair RAM
Large hard drives

Any help would be appreciated. I've tweaked all the graphics settings to no avail.