Not necessarily bad but by doing so, ComboFix related files and folders will remain on the system if you ran the tool before deleting it. The correct way to uninstall ComboFix can be found here
. If you have not emptied the Recycle Bin you should be able to restore the file to your Desktop and follow those instructions.
-- If you encounter any problems using the switch from the Run dialog box, just rename ComboFix.exe to Uninstall.exe, then double-click on it to remove.
BTW, if you have not already done so, please read ComboFix usage, Questions, Help? - Look here