Win 10 does not start, only blue screen?

If you start the laptop from Packard Bell Windows is still running normally. You still get to the login, then it is quite a while, that Windows is prepared. Then comes Picture 1 (sorry for the bad quality)

Or a bluescreen with the errors: invalid process attach attempt

So you are not able to work on the laptop or something to uninstall or install

And why do not you reinstall Windows?

Or start the laptop in safe mode or in repair mode.

Shortly after switching on press Ctrl + f8, quietly quite often, you often miss the right time.

This is easily solved: You play back one of his system partition backups.

If you do not have a backup (although that since decades the sparrows from the roofs whistle, that you need something like that) has just had bad luck and seized the toilet.

Hard drive broken or registry shot up.

From a repair disk (the Win Install CD is synonymous) start and thus first check the hard drive (chkdsk).