Hello 47dfb,
Welcome to the HP Forums!
I understand you would like to "Clean the Printhead" on your PSC 1355. I will do my best to assist you! The reason why you don't have HP Director anymore on your Windows 8 computer, is because there is only a basic print driver. There was a full feature driver for you Windows XP computer. This information is stated here.
You are unable to "Clean the Printhead" from your computer, but there is a workaround you can try. Please follow this HP document on Missing Color, Wrong Color, or Streaks in the Printout.
Please post your results, as I will be looking forward to hearing from you. Have a great day! :smileyhappy: