Hi hazerava!
1) Launch sfc /scannow from an elevated command prompt
2) Scan your system with these softwares:
Full scan with your antivirus
adwcleaner (click)
Junkware removal tool (click)
superantispyware free (click)
sophos virus removal tool free (click)
MBAM free (click)
stinger 32 bit (click) or stinger 64 bit (click)
(according to your windows BIT version)
MS Safety Scanner 32 bit (click) or MS Safety Scanner 64 bit (click)
(according to your windows BIT version)
3) Try to start your pc in safe mode and see if it happens the same. If it works in safe mode, try a clean startup
