Every time I try to use G'mic it immediately crashes the program...
What can I do?

I'm using Windows 10
And this is my graphics card: 1534MB ATI Mobility Radeon HD 3400 Series (Toshiba)
And motherboard: TOSHIBA Portable PC (CPU)

The problem with G'Mic and Windows is that G'Mic's parser needs a huge amount of stack memory. For the second animation beta, we'd forgotten to manually change the stack space; that's fixed now and I've uploaded the new build. I'm also doing new builds for 2.9.10 and I'll take care to set the stackspace there with editbin /STACK:999999999 krita.exe before packaging and uploading.

I hope that with Visual Studio 2015 this is going to be better; in another VM I'm build a 3.0 pre-alpha with that, and I hope that I'll be able to package it this time for testing.

I didn't get some of that... ;_;
Is it hopefully going to get fixed?
Also what's that visual studio.. should I get that?

Visual Studio is the compiler Microsoft made which we use to build Krita on Windows. Sorry for being so technical, it's partly that this situation with g'mic has been dogging me for ages now!

What boudewijn is trying to say is that it's a problem with the way G'Mic is designed: Microsofts compiler(the program that turns code into program you can run)doesn't understand the code very well, causing crashes. We're hoping that a new version of the compiler fixes the issue.

Please re-download 2.9.10 or the second animation beta and try again... I hope I've fixed it now, though on 64 bits machines with less than 4GB of ram, it might still be problematical.