wp-admin not working

I am having issues getting to my dashboard. I have my WordPress installation in a sub folder on my server where I have other WordPress installations. Though I have never run across this problem before. When I try to go login, the url of the page shows:

http://www.mywebsite.com/websites/mywebsite.com/wp-login.php?redirect_to=http%3A%2F%2Fmywebsite.com%2Fwp-admin%2F

I try to login with the correct user and password but it redirects me back to the login page. I know I am using the right password because when I type in a wrong password it states that it is wrong.

I am not sure what all info I need to provide except that this website is in a sub folder of another website.