Can't Save some Joomla functions after reinstalling

Hi,

Not really. The javascript error you have related to HikaShop is because the system tries to use the files from your old website instead of the new ones because of the way your server is configured. As I said, you can solve that in two ways:
- copy the files from public_html/en/media/com_hikashop/ to public_html/media/com_hikashop/
- hire someone to fix your server setup
Copying the files can be done either via the FTP access provided by your hosting. Just log to your FTP with a FTP client like filezilla with the FTP access you have, download the files and folders from the folder public_html/en/media/com_hikashop/ to your local computer and upload them back to the folder public_html/media/com_hikashop/ and your HikaShop javascript problem will be fixed.
Now that will only fix the javascript error coming from HikaShop's javascript. But if you have javascript errors coming from other javascript files (because other extensions or even joomla itself don't use the correct version of their javascript files), that will also break your backend interface and it won't be linked to HikaShop at all. That's why I recommended that you should also look at fixing your server setup since you'll have many such errors in the future if you don't.