well lets take this one error at a time
your 2nd post you have input an incorrect server path to your vbulletin installation hense we can not find the
vb global.php file
your 3rd post you did not enter the correct vbulletin table prefix so when you did the last step on install to get the
vb usergroups it could not do it
I would suggest rerunning install and on the last 2 steps make sure you enter the proper vbulletin table prefix for mysql and also on last step enter the right vbulletin server path info