Hello, Andrew, thank you so much for your help! Yesterday I got endless problems with wordpress/nextgen gallery. I have now solved it. It all started with downloading Nextgen gallery as for some reason I can't get it to work properly. When I go into the Gallery option to upload pictures, the page was blank, so I downloaded extensions. That is when it all wrong.
With your suggestion I have reloaded my wp-config.php afterwhich I tried to log into my wordpress site and came up with another error connected with Nextgen. from there I went back to my ftp, deleted nextgen gallery from my directory and it worked! Phew! Now I am in the process of trying to find a good picture gallery plugin (that works) to upload. If you have any suggestions it will be mostly appreciated.
I am a beginner at this so thank you very much for your help.