I had this exact same issue when turning my Dell M1530 laptop on today with Windows 7 RTM 32-bit which I installed yesterday. I have Norton Internet Security 2010 beta installed, I think this may be the cause.
You also seem to have Norton but the 2009 version, I believe the 2009 version is also in beta for Windows 7.
I think this could be a problem with Norton even though you said it works for your laptop. We should try a different security product which should solve this issue.