Hello there!
Recently i have changed my domain name due to expration of the old one, all the files where untouched.
Now when i enter: mywebsite.com it takes me to (Doesn`t exist), but if i enter: mywebsite.com/modules/news it takes me to the right place-beginning of my site.
Then it asks me for username/password as it used to ask before, but after inserting the reg. details and hitting Enter button instead of proceeding to the main page like: mywebsite.com/admin.php it takes me to the old page : my OLDwebsite.com/admin.php which doesnt exist

What could be a problem, is it XOOPS or Hosting dns error?
I really don`t want to reinstall everything from the beginning

You haven't updated the mainfile's XOOPS_URL definition to the new domain.

For reference, see the XOOPS FAQ's Migration section

Quote:

Great help.
For future reference:
Open mainfile.php in your main directory.
replace old site adress by the new one.
Save it.
Replace mainfile php with fixed one
done!