I am having problems creating a new wordpress account. I previously had an account on wordpress, I uninstalled wordpress as it was having problems trying to recover my wordpress account because it cannot identify my details. Now, when I re-install wordpress and enter new login details, it keeps saying I already installed wordpress. I am certain I have removed all the wordpress contents in my C: drive before re-installing wordpress.
Plus, I even uninstalled WAMP and still gives me the same result.
Here's a screenshot of what happens after I have enter new login details:

Note: I installed wordpress locally on my computer, I haven't used any hosting website.
Any suggestions?