The answer is simply no. There is no uninstall on better than 99% of the machines out there since such is only offered if you upgraded from some other OS and saved the files to go back.
"Can I install again without deleting."
Yes. But whether this will have the effect or repair you are looking for is unknown.
While you ask one question, it would have been useful to tell why you needed to do this.
I want to re install windows me but it does not apear in add or remove programs box.
Can I install again without deleting.