When playing Warrior it Crashes

I'm not sure hot posts picture here. But basically when I play my warrior while switching quickly between stances it crashes.

Getting fatal exception error.

The instruction at "0x008D2412" reference memory at "0x0000000".
The memory could not be "read"

Click OK to terminate the error.

I lowered my graphics and stuff but that ain't it. Since it's going great on my rouge character. And it's not processor or memory stuff I was monitoring my task manager it does go above 90% on CPU but for the RAM it's only 600mb.