What are those unknown Programs on Windows XP that can be deleted?

I have recently posted a question about my problem with my laptop running slow. I've read all the suggested solution and tried those that can be done while online. However, I have another problem that needs help.
What I'm trying to do is to free my disk drives space from unnecessary software's or programs. So I go to Control Panel under Add/Remove Programs. As I've checked on it, I'm wondering what are those unknown Programs. I am wondering what are those and should I delete it? If I delete them, will it cause a major problem to my laptop, OS or application software's.
To give you an exact idea of what are those programs, I've provided a screenshot of it below. The unknown programs is underlined in black lines. I want to know if those are important programs in my laptop and should not be deleted or remove.
What are the effects if I delete it?

