2
That's not enough information to be able to help.
Please run a file check to make sure that you have all the required files.
Place the files:
checksum.php
checksum.md5
in your XOOPS directory, and then run the checksum.php from there.
This should give you some info, if there are any missing or wrong files.
You can ignore any reports about missing files in /install directory, as this directory should be removed or renamed by XOOPS.