ok - all my problems have been solved:
1 . night issue - changing from default / integrated graphics to regular graphic card
2. inventory, spell book etc opening for 1 minute or so - running game in windowed mode - used the command:
3. changing resolution to 800 x 600 or slightly higher - 800 x 600 the picture is slightly cut at the bottom but I can live with it, with higher the window is smaller
4. mok cshell
5. config file changed - max fps "0" changed to "35"
these are not my ides. I have collected stuff from here gog discussion, celestial heavens and Polish site "kwasowa grota"
Well, it is not optimal but since I am not a guy of exorbitant expectations I will give a solo necro a try *evil grin*