Hello RoksVempire,
Type in to Run... and see if that helps:
reg delete HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ /v "CB Active User" /f
This will delete the "CB Active User" entry at the above key which got an autostart entry to the cmdbkstart.exe. You can also delete it manually by typing "regedit.exe" to the Run.. field.
Arki