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>>copied qtsql4.dll and qtcore4.dll to
they must be found in one of PATH (application directory is "PATH" too???) environmet variable directories. Plugins directory is not such.


>>But I have mingw, not msvc 2005. Is that the problem?
libpq.dll depends on MSVCR80.DLL (it's msvc 2005 redistributable). You can see it in depends.exe

The dlls search order:
http://msdn2.microsoft.com/en-us/library/ms682586.aspx

after changing environment variable you need to rerun applications (console) or even better reboot.

The application which will be runned by double click. The ms dll search algorithm is described in the earlier mentioned page.

What show depends.exe? Are all dlls found (in qt sql plugin directory must be left only qt sql plugins. Delete, move everything exept qt sql plugins related stuff and review the plugin dependencies)? I have two warnings.

Do not forget to remove invalid registry value.

What shows depends.exe when exploring plugins\sqldrivers\qsqlpsql4.dll (in "plugins\sqldrivers\" must be only qt sql plugins stuff other stuff must be deleted or removed)?

Quoted

Try the following
run regedt32 goto "HKEY_CURRENT_USER\Software\Trolltech\OrganizationDefaults\Qt Plugin Cache 4.3.false\C:\qt\plugins\sqldrivers" (the registry key can differ)
and delete psql dll entry.
Rerun sqlbrowser demo.

I do not think so. My english is horrible and there is nothing to write.

There is helpful resource - http://qtnode.net/wiki?title=Qt4_on_Windows

There is simple steps.

Download and unzip qt. If you unzip it in c:\qt then [qt base] equals c:\qt
Download and unarchive mingw32 packages 3.4.5 core, binutils, g++, runtime, winapi, make etc but no msys.
Download and unarchive postgres win32 binaries package.
Add following directories to PATH environment variable -
[qt base]\bin
[mingw32 base]\bin
[postgres base]\bin
[postgres base]\lib

run new console, issue "echo %PATH%" and verify PATH variable is good.
>cd [qt base]
>configure ...whatever options... -I[postgres base]\include -L[postgres base]\lib -lpq -plugin-sql-psql
>mingw32-make
And do not forget about qt postgres plugin registry value.
Personally I'm finishing this quest because I feel that I will fail to explain more clearly.

Well, can you connect with same user credencials to server from original postgres console client (psql.exe)?

Postgres server must run.
Database must be created.
User with some rights must be created.