Uninstalling wordpress

I did a custom install on wordpress but a couple of its features, such as media gallery, were not working. I used filezilla to go in to FTP to remove the files and tried a reinstall but it’s not working. I have used wordpress on two other sites and have not had this problem. Any suggestions?

It would be easier to troubleshoot if you were more specific about the exact error and named the features (plugin?), other than saying media gallery.