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[Ask Help] My ZBrush keeps on closing on saving

Hello, i’m still a newbie in ZBrush, & currently i’m teaching myself by using Eric Keller’s book Introducing ZBrush in creating the Medusa maquette. Right now, i’m already at the stage of adding scales to my Medusa tool, & soon will be starting the polypainting stage, & done. The thing is, every time i want to save my tool, the ZBrush just keeps on closing down. So, i basically can’t go forward on making any progress. My ZBrush just doesn’t let me finish it, & i have no idea why. I feel kind of disappointed because even though i’m just doing a tutorial, i still did my part by creating the whole thing from ground zero instead of using the given tools in the package provided. I’m not disappointed by ZBrush, but by my lack of knowledge in figuring out the problem & solving it. So, can someone who’s far more experienced than i am help me figure out what the problem is, & probably tell me what to avoid in the future so that this kind of problem doesn’t happen, again, because i totally love ZBrush.

Here are the specifications of my ZBrush, tool, & hardwares:

ZBrush version used: ZBrush 3.1
Medusa tool size: 135 MB
Active Points: 2.293 mil
Total Points: 6.698 mil
All preferences in ZBrush are still in default mode

My Computer:
OS: Windows XP Professional SP3
Processor: Intel® Pentium® Dual CPU E2200 @ 2.20GHz (2 CPUs)
Memory: 3584MB RAM
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Display: NVIDIA GeForce 9300 GS
Display Memory: 512.0 MB

I also already tried the Test Multithreading, & it didn’t help.

Please help me, & thank you so much for any of u who’s kindly enough to pay attention to my problem & help me solve it.

Is this the trial version that you’re using? Or have you purchased ZBrush?