2 Months of relentless searching through many, many threads, only to discover that no one really wants to answer this question. WHY are you getting the BSOD after boot into windows 7?....Well let me guess, you installed windows ( A CLEAN INSTALL, AS I DID) and it seemed to work fine. You then installed all updates or your Nvidia driver and rebooted.......PRESTO! BSOD.
The answer to this problem is one that Microsoft, Dell, and Nvidia all dance around and point fingers at everything except the truth....and that is, unless you are the rare exception, you are gonna have to buy a new windows certified graphics card or continue to use the windows basic driver for your old one.
Case in point....I have a Dell Inspiron 9400 E1705, running an Nvidia GeForce go 7900 GS 64 bit. I upgraded from XP to Vista, no problem, full graphics. Then I upgraded to windows 7, again, no problem, full graphics. keep in mind that each was a CLEAN install.
I then upgraded to Windows 8RC with no problems.
When I converted to Windows 8 BSOD began. I upgraded again to Windows 8.1 only to discover the BSOD all over again. Each time I had to roll back my video driver to the basic in order for my display to work.
Now I have reinstalled Windows 7 (being not so happy with windows 8) only to find the BSOD again. Keep in mind this was the SAME disk I used to install windows previously. Microsoft and Nvidia BOTH offer a specific driver for my card which causes the BSOD. Dell will not allow me access to any windows 7 drivers because my product was originally shipped with XP, Their solution ? Buy a new Laptop!
So , go ahead, search the internet. You will find, as I did, that all previous driver files for my specific card have been removed, and you will be redirected to the newest build, which simply won't work.