钢铁的价格:电脑玩游戏出现蓝屏

电脑使用了一年多没问题，最近在玩《魔兽世界》时，进入游戏后几分钟会出现蓝屏:
A problem has been detected and windows has been shut down to prevent damage to your computer.
The problem seems to be caused by the following file: SISGRV.DLL
PAGE_FAULT_IN_NONPAGED_AREA

If this is the first time you've seem this stop error screen, restart your computer. If this screen appears again,follow these steps:

check to make sure any new hardware or software is properly installed. If this is a new installation,ask your hardware or software manufacturer for any windows updates you might need.
If problems continue,disable or remove any newly installed hardware or software.Disable BIOS memory options such as calhing or shadowing.If you need to use safe mode to remove or disable components,restart your computer,press F8 to select Advanced startup options,and then select mode.

Technical information:
***STOP: 0x00000050(0xEEB7AFFC,0x00000000,0xBFA33A40,0x00000003)
***SISGRV.DLL-Address BFA33A40 base at BF9D3000,Dtestamp 00000000

上网不会出现，玩《魔兽世界》就会有，而以前玩《魔兽世界》很正常。
各位高手救救我啊！