"Preview" is redirecting to Posts page

When I click preview, it is redirecting me to the Posts page, which is completely irrelevant. I can’t make any changes in a post or delete things because it won’t even save when I click Update either.

I really need help because I need to launch my website by the end of the week and nothing is working. Everything was working fine before I installed the Gallery Bank Plugin for image gallery. Is something not compatible? I tried to uninstall the plugin through wpadmin and my FTP but the galleries on the page are still not deleting…I can’t preview anything and when I click update, my new changes are not saved.

HELP!!!!! I am lost here and have googled for all kinds of help. I really wish wordpress had a phone number to call for support. ??