You delete old account by going into control panel, then user accounts and click on the account you want to delete. But in order to do this, you must be logged into your new account. Can't delete old account while logged into it.
The new account needs administrator privileges before you can delete the old account. Log back into the original account. Create a new account and make sure you set it as administrator.
Ah, its now starting to make sense now. It seems this is a firefox issue, articles online about it. Uninstall and then reinstall firefox and see if that fixes the issue. Make sure you install fireofox to your c drive not any other partition.
If a reinstall doesn't help then visit here.
https://support.mozilla.org/en-US/kb/cant-download-or-save-files
Does IE work? Try the Pale Moon browser? If all4 don't work then its a windows issue and you should reinstall.
So you have tried reinstalling both firefox and chrome? and tried the suggestions on that page I linked? Probably should do that before doing the reinstall. I'm not too familiar with the new workings of windows 8 but that looks like thats the route you need to do according to your image.
For future reference of those reading the forum.
I got the download issue res loved by creating a Microsoft account.
I originally did not want to use one as I don't like having account for everything but this day and age I guess it is a requirement to go on with our lives.
Windows 8 requires a Microsoft account for almost everything. I thought why would I need that to actually save files. But turns out you do!
I even asked this question on the Microsoft forums and never got a straight answer as to why I did not have permissions.
I finally made a Microsoft account and everything was resolved.
Talk about control over your life!!! Good Luck!!