Asking for another install after server change

[kronnos]

Ok i added define('DISABLE_HOOKS', true); to config.php and now site loads. Ofcourse the style is without any images since I did not copy the style folder and the chatbox and other pluggings do not work.

What do I do next? Should I install the plugins and then remove the code I added to config, then add the plugins I do need?

Also, i will be upgrading this version(3.6.7) to 3.8.1. So the old plugins will not work anyway but there is something I still would want to keep. For example: I have iTrader which I will install the newers version for 3.8.1 but I still want to keep the database from old iTrader. Uninstalling it will delete the database, should should I just add the new itrader on top without uninstalling first?

--------------- Added [DATE]1234435507[/DATE] at [TIME]1234435507[/TIME] ---------------

BTW, what could be causing the problem of me loging in and then having to do it agaian and again. It doesn't save my login info.