We are M$. Resistance is futile. Your puters and lappies will adapt to service us. We will add your technology to our own. M$ has announced that Windows is NOT a top priority. Pushing people to use the cloud and mobile has become their main focus now. Now the truth about 10 is coming out.
Since you did not list the make or model number , this is a generic answer. Some or all of it might help you.
Did your system come with 10 or did you downgrade to it. If you downgraded then you no longer have a recovery partition to reset it back to factory settings like it came out of the box.
Since it will not boot you will have to build a bootable thumb drive to boot the lappy. If you upgraded to or have 10 you can create a install/repair thumb drive with the link below. This will allow you to try to repair 10 first and if that does not work do a fresh install. If you have to do a fresh install make sure you have a good product key and all the drivers before starting a fresh install.
https://www.microsoft.com/en-us/software-download/windows10
Once you get it created you can boot your lappy and use the link below to try to fix the problem. You can use advance options to try a repair 10. If that does not work then you can go back and use the rest feature to set 10 as if it has just been installed.
http://www.tenforums.com/tutorials/2294-advanced-startup-options-boot-windows-10-a.html
If you're able to fix it or reset it use the link below to turn off Windows update installing drivers.
http://www.tomshardware.com/faq/id-2763685/stop-windows-automatically-updating-device-drivers.html
If you turn off M$ updating your drivers you will have to get them at the manufacture site, which is better for you.
If that does not work, the next thing is to try to recover your files. For this you will need a bootable thumb drive(flash drive) so you can boot the lappy. This will also allow you to verify that the lappy and its hard drive is good and all you have is a Windows problems. You will need to find a working puter to download Unetbootin USB installer. You need to read the instruction carefully and know a little about Linux to use this. There can be dragons present if you do not understand what your doing. I make no guarantees.
http://unetbootin.sourceforge.net/
Once you make the bootable thumb drive you need to add a OS for it to boot. I recommend Linux Mint ISO. Its UI is similar to Windows. Download Cinnamon 32bit.
http://linuxmint.com/
If you have a Windows 8 or above then you need to turn off secure boot and select boot from USB before using the thumb drive. The thumb drive boot will also allow you to check out the rest of the puter. It helps to have a thumb drive or a external drive hooked up when you boot so you can copy your data and files to.
If it has a CD/DVD you can burn Linux Mint ISO right to a CD and boot with it.
Once you got the bootable thumb drive created, insert it into one of the USB ports. Also plug in the medium you selected to copy your files to. Press the power button and start tapping the ESC key. This should bring up the boot menu. Select the USB thumb drive and it will boot to a menu asking if you want to start Linux Mint. Click on Mint and let the system boot. Find your hard drive and copy your files to your back up medium. If the hard drive is a SATA drive it will show as sda. If it has partitions then the first partition (C Drive) will show as sda1, the next partition will show as sda2 and so on. If you have 2 drives the next drive will show as sdbx. X being the partitions if it has any. Normally external drives show as sdd or sde. I have seen Linux recover data that people claimed could not be recovered. Keep in mind while looking for your files, and this is a Vista or above version of Windows, that you have to find your USER folder. The folder will look something like this. \Users\nameofuser\Documents. Repeat that for music, pictures, and videos.
Once you have your files backup you can do a clean install of 10.