BSOD Windows 7 Ultimate x64, 0x0000003B

I recently upgraded my laptop to Windows 7 about 3 weeks ago and all of the sudden within the past day or two I have been getting the BSoD at Start-Up and then it shuts itself off. I have read other forums that tell you to open Windows in safe mode, but it won't even let me do that! All it does is tease me by getting to the desktop for maybe 15 seconds and then the blue screen pops up again and I'm back to square one. So, I can't even download the SF Diagnostic Tool in order to get all the information on here that one might need.

I don't recall installing or removing anything recently. I had Vista installed and then ran the upgrade disc.

The problem with that, is that I can't even get into my start up, let alone the internet, before the blue screen pops up and then shuts my comp off.

Ok, so I downloaded windows defender and put it on a CD. So what do I do in order to restart my computer using windows defender?

What does it mean to restart my computer through the program though? That's what I don't understand.