Whether you're an experienced Windows user or a complete novice, it's not nice to get a blue screen of death. This means your PC or laptop system has crashed in dramatic fashion. Sometimes a simple reboot will fix the problem but sometimes things are a little more complicated.
Various error messages may appear when you're getting BSODs but we're looking at ones related to ntoskrnl.exe here. This is related to the Windows kernel and isn't a good sign, especially when you're getting a BSOD over and over again.
Your problem is most likely caused by ntoskrnl.exe+6f880 and ntoskrn.exe+75bc0 – and you might be getting messages like "The procedure entry point could not be located in the dynamic link library GDI32.dll.", "Fatal error, Windows will restart in 1 minute" and "Fatal error, Windows will restart in 1 minute".
There're various things you can do to investigate the issue such as look through a mini kernel dump file. To save you time, here are some things you can do.
How to fix ntoskrnl.exe BSOD
Check your memory
The ntoskrnl.exe BSOD is usually related to memory so you might need to simply replace your RAM. Take out each stick of RAM one by one and try to boot your system, this may help you find the faulty memory but the lot might need replacing.
If you're overclocking your system with a higher CPU clock speed, put this back to normal as it might be causing problems.
If you have a RAID setup of disk drives, update your drivers. Also update other drivers for hardware as this problem can be caused by drivers not matching the OS.