Reserved Querystring Parameters In SharePoint

This is probably the 100th post on the net about...

"Be careful when naming querystring parameters in your SharePoint applications"

But you can't say it enough. They cause trouble!

For more info read this.

Could not access the Search administration database. A generic error occurred while trying to access the database to obtain the schema version info.

Deleting the following registry key - did the trick for me:

“HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\Web Server Extensions\14.0\WSS\Services\Microsoft.SharePoint.Search.Administration.SPSearchService”

In fact, it's just one of the things that need to be verified.
Read this post for more info.