domir21 About 2. I don't know how to fix this database problems.
If you do not need Virtuemart installed then you can uninstall it -
After you uninstalled it then login to your database and with phpmyadmin remove all Virtuemart tables -
This could help in case you want to reinstall Virtuemart or to remove your actual error if you do not need Virtuemart installed -
Hope it helps