What happens when you delete them and what are you using to do the deletion.?
I suspect you are not erasing the actual items, but the reg keys that keep track of them. That is why they get replaced.
There are a few free reg cleaners that have a nifty automatic cleaner that does pretty well.
I use reg Medic, that I paid a few dollars for and it is safe to use in auto. It roots out all of the locations and creates a backup if you screw something up.
Your op system is part of the problem. It is a real piece of work. I dumped mine and got XP.