My web server was knocked offline when I tried to upgrade. Currently, in add/remove programs it shows v8.6 but the plesk name server is v9.4. I can't get the home page of the control panel top resolve to index.php3. The error reads: Notice: Use of undefined constant SPN_PATHBAR - assumed 'SPN_PATHBAR' in C:\Program Files\SWsoft\Plesk\admin\plib\class.Pathbar.php on line 40 Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\SWsoft\Plesk\admin\plib\class.Pathbar.php:40) in C:\Program Files\SWsoft\Plesk\admin\plib\auth.php3 on line 502 I am looking for a way to either roll back to 8.6 or complete the upgrade to 9.0 without losing all my customers websites and email. It's bad enough that they are offline at the moment due to this. Can anybody provide a clue as to what is going on?