no themes available

I download a couple of themes. Unzipped them and followed the instructions on saving them wp-content/themes. now when i click on Appearance on WordPress, I see no themes, not even the default. I see

Current Theme
by

All of this theme’s files are located in .

Available Themes

Broken Themes
The following themes are installed but incomplete. Themes must have a stylesheet and a template.

Name Description
Stylesheet is missing.

My page is now blank.
Please email me with help! the support sucks around here, [email protected]