Windows 7 continues to shotdown my MacBook Pro.

I have reviewed the following list of MacBook Pro computers and I have a early 2008 15" MacBook Pro. I continue to have random shutdowns of my MacBook Pro while I am running Windows 7. The is no ryme or reason as to when a shutdowm will occur. It just turns off my computer. Can anyone help me resolve this issue? I have upgraded Bootcamp and my snow lepard software so I have all the updates.

Neal