For some reason, revision 4 crashes Dwarf Fortress (revision 1) does not.
Using Windows XP Professional SP3.
With 1.5GB of RAM and basic stuff. hah.
Windows XP?! That might be your problem right there. :-)
It's either dfhack or twbt, neither of which were in revision 1. Revision 2 doesn't have twbt I think, but it's buggy from what I read back then.
It's not Windows xp, the game is a 32 bit game and there's no reason to believe it'd cause problems in and of itself. I really doubt the game uses any new external dependencies since 40.00 started. You can disable twbt by going to Dwarf Fortress 40_10 Starter Pack r4\Dwarf Fortress 0.40.10\data\init and opening up init.txt and finding [PRINT_MODE:STANDARD] and changing that to [PRINT_MODE:2D].
***Edit: The revision 4 uses a older twbt which isn't as optimized as the newer generation(which is buggier atm) and I was going to suggest turning multilevel off but you won't be able to use twbt with your computer without some lag which you can't afford mate, not with the 3.xx version. In the 4.xx version only the multilevel causes lag, the graphic files twbt adds in the 3.xx cause lag in that version but not in 4.xx from what mifki says. You just want dfhack to be able to run the clean command and other features it adds which reduce fps reductions.
1.61GHz and 1.5GB RAM, runs on about 20FPS. :p
"AMD SempronTM Processor 2800+" thing on Windows XP Professional SP3 with "NVIDIA RIVA TNT2 Model 64 (Pro)" as graphics card.
SHOW ME YOU MOVES PC
Since your computer is pretty bad and even high end computers slow down later on it's likely you won't be able to have a fort for many ingame years. Unless you use the clean command a ton and don't have any big water projects and overuse quantum stockpiles.
One thing I'd suggest, is to move FONT and FULLFONT definitions to the overrides.txt from the init.txt. That'd make it easier to fall back to non-twbt rendering.
-snip-
The graphics packs are at most 4-5mb. It'd be nice if the launcher had an option like some torrents do where you can download only certain files (so you'd download the main pack and then in the \LNP\Graphics you'd just choose what packs you wanted. (I so want this in the one launcher for mods pack, in this section)
Or the starter pack can just add a option to edit the init.txt to change [PRINT_MODE:STANDARD] to [PRINT_MODE:2D], because that would be easier. It already edits other stuff in those files why not add that to it to? Since it turns twbt off just as well as what you suggest.
It'd probably help if you made the part in the first post that says
changelog is in the second post stand out more, people seem to miss it.