Plesk no longer works after upgrade from 7.5 to 81

[outsourcethis]

When I upgraded from 7.5 to 8.1 it cause my database to crash...WTF???
When I click on any of my doamins I get this:

Unable to create WebServerManager object: Can't manage web features: Invalid pointer (COM Error 80004003) at addLinkSite(webmail, C:\vhosts\webmail)
---------------------- Debug Info -------------------------------
0: C:\Program Files\SWsoft\Plesk\admin\plib\class.DomainControlForm.php:85
DomainControlForm->assign(object of type BsDomain)
1: C:\Program Files\SWsoft\Plesk\admin\htdocs\domains\dom_ctrl.php3:148


I can't create an domains I can't edit any domains.

When I use Webmail I get the following error when I clcik on a email or try to creat one, delete one, etc

A fatal error has occurred
DB Error: unknown error
Details have been logged for the administrator.

WTF? I don't think this thing was ready for prime time.

Anyone have any ideas besides rolling back to a work version?

 

[sergius]

please delete registry key [HKLM\SOFTWARE\PLESK\PSA Config\Config\SitesCache] and try again.