Black Login Screen after SP3 Update

Not sure if this is the right section of the forum to post this because I'm new here.

I am using my school tablet to write this since my other (gaming) laptop is unusable as I will explain.

A few days ago I turned on my (gaming) laptop computer and, after briefly showing the "Starting Windows" screen, the screen simply went black no login screen. There is a mouse which is perfectly responsive and moveable. I held down the shutdown button so the laptop switched off, then restarted. A screen came up saying "Launch Startup Repair (recommended)". I then deduced how this problem came about.

1. Used my laptop the night before.
2. Closed the laptop lid, thus beginning sleep mode. Battery probably at 15%.
3. When the computer ran low on battery, it turned back on (which frequently happens) and, as the computer had updates to install, began shutting down and installing the updates, rather than the usual hibernation because 'Shut Down' is the default setting when there are updates.
4. Computer runs out of power halfway through installation. Bad install (which I now know isn't the case).
5. I turn on computer and - BINGO! The login problem occurs.

Now, I repaired my computer and restored it to an earlier session. I then noticed that League of Legends wouldn't open (probably unrelated and have contacted Riot support). So this morning I decided to shutdown and install all the updates (which the battery charging, to make sure that there was no failure), which I think included SP3. The same "black screen at login" problem occured. The "VAIO" logo appears, then the "Starting Windows" screen (with the logo above). Then, blackness with a moveable mouse. I press the off button to hibernate and nothing happens, but if I hold it down the computer shuts off completely. I can't access any of my files or even login, so the only way to use my laptop is to use the Windows Repair, which takes over 2 hours.

I am using another laptop to write this.

So, how do I fix this? Can anyone help me?

My laptop with the issue is a VAIO VGN-NW25GF (says on the sticker on the front) running Windows 7 Home Premium using "ATI - Radeon" and "Intel Core 2 Duo". 64 Bit with 2GB of RAM and 320GB hard disk.

Please help. Apologies for the essay/novel.

Ztruker said:

There is no SP3 for Windows 7, only SP1.

I would restore it again then apply the updates one at a time to find the one causing the problem. You may have to restore one more time after than only this time do not install the update that is causing the problem and mark it not to be offered again.

The alternative is to save your data then restore to factory new via the partition on the hard drive. Check the manual for how but usually you can find it via the Start button or by pressing a Fn key (F10 or F11 often) during boot.

I went with your idea, but how do you disable individual updates? My computer already wants me to install (or reinstall) those updates and I haven't figured out how to disable them.

I'm fairly sure that SP1 installed correctly but I have restored it to earlier. The other 3 updates have to do with Microsoft .NET Framework, so would those updates be potentially the ones causing problems?

As for SP3 to SP1, sorry. I was thinking of XP