For me it looks like a virus infoection.
Open regedit.exe and search for "jyku.fjo" - if it's somewhere in: HKCU\Software\Microsoft\Windows\Currentversion\Run or HKLM\... the same... , then - ust delete it, and full scan your computer.
Also search whole hard drive for such a file and remove it if youfind (for safety reasons - you can create some folder (that is not in your PATH) - and move it there for a while.