the admin issue is probably the js.index.php file permission. Try 644. When using the Magento connect, on some server set-ups, it causes permission errors. If this is the case you often have to check that a) the new files have been copied to your server and b) the permission’s are correct
You are a Genius Mediagang ! The problem was the permissions on the file :
It was 666 and should have been as you mentionned 644
I’m happy. Cheers all for your help !
There still seam to be a few more issues that I must correct, but overall, everything seams to be back on tracks.