Sorry to revive a week-dead thread, but the 32-vs-64 bit thing is like this:
32 bit - can only see 3GB of ram. Having 4GB as a single module is OK, and its as good as you're going to get *unless* you reinstall with the 64bit version of the OS. Not sure if you have it or not, but the 64bit version can physically see more RAM than you can fit into that box.
I have 64-bit Win7, and 9 also crashed on me after diddling the sliders a bit. I had to upgrade to 10, and have had no problems since. Even with the 64-bit upgrade (double the price), it still runs fine for me. No crashes.
My advice: get 10. Easy and done.
Now, as for the crashing, the 32-bit version of the program, if it's 9.0.14 (I think that's the version?)