windows 7 crash just after login

Yes i did the secure file check and it found nothing. here some more information: after changing the file name I logged in on my account and this time as I mentioned it went ok. But as I started internet explorer it crashed. So I rebooted in save mode and in my account it crashes also. When I use my girlfriends account I can log in in savemode (have been doing this all the time without much thought but maybe it is important).
So now we´re back at the start, it crashes after login. when i log in normal mode into my girlfriends account it also crashes.

ok for now at least thanks very much for your time, I await the assist, hopefully we can solve it.
kind regards

Uninstall Daemon Tools/Alcohol 120%. They use a file sptd.sys which is notorious of causing BSOD on Windows 7. Use this SPTD uninstaller when you're done: DuplexSecure - Downloads
Select Uninstall; DO NOT SELECT RE-INSTALL

You can use MagicDisc as alternative: Freeware MagicISO Virtual CD/DVD-ROM(MagicDisc) Overview

Hi Dean and Maguscreed, I uninstalled Deamontools and ran the sptd uninstaller but unfortunately no effect. the sptd uninstaller says: no SPTD version was detected. And the uninstall button remains gray (inactive). the blue screen just after login remains. So this was unfortunately not the problem. I await further advise, thanks for helping

Create a system restore point. Navigate to C:\Windows\System32\Drivers and rename sptd.sys to sptd.bak

should i create a restore point before changing the name? how do i do that in the command line?

Yes, create a restore point before changing the name.