This was probably caused by the following module: ntoskrnl.exe (nt+0x32492B)
Bugcheck code: 0x124 (0x0, 0xFFFFFFFF848BC024, 0x0, 0x0)
file path: C:\WINDOWS\system32\ntoskrnl.exe
Problem started after I installed Demon Tool (later uninstalled it in safe mode) and downloaded one .mkv file on desktop (coudn't delete it, tried unclocker too).
Have tried almost every piece of useful info. available over net, even did sfc /scannow (cmd window closes soon after giving this command) but all in vain.