win7 64bits最近常常用到一半就當機了...wininit

如題
平均一天會當個兩三次
進到事件檢視器裡面看到的錯誤資訊為wininit
其餘資訊如下

System

- Provider

[ Name] Microsoft-Windows-Wininit
[ Guid] {206F6DEA-D3C5-4D10-BC72-989F03C8B84B}

EventID 11

Version 0

Level 3

Task 0

Opcode 0

Keywords 0x4000000000000000

- TimeCreated

[ SystemTime] 2012-08-30T07:34:42.475435700Z

EventRecordID 8557

Correlation

- Execution

[ ProcessID] 2636
[ ThreadID] 2744

Channel System

Computer ozaki-PC

- Security

[ UserID] S-1-5-18


- EventData

StringCount 1
String C:\Windows\system32\appinit_dll.dll

請問有大大知道這是發生什麼問題嗎
跪求解答了>"<