When I first put the computer together, I installed VISTA, got it up and running.......about a month later, I bought a copy of WIN 7 when it came out. I just popped in the Installation CDs and Away I went.
The Driver Robot program I used just told me which drivers it "thought" needed updating. It was then up to me to manually uptade drivers, & I was very selective in my driver update process.
The BSOD is happening seemingly randomly. I could leave the computer at the logon screen, or performing any number of random tasks.
The BSOD problem got to the point where the BSOD would appear before I could even click the start menu button. So in my frustration, I have purchased a third 1GB hard drive (I got a very very good deal), and have re-installed Windows 7 on this. I have very careful in updating drivers and installing applications. The system is very stable at the moment and I have not received any BSODs with this OS installation. I am keeping my fingers crossed.
If it starts to happen again, I will be back in this post. But for now, thank you for your help.