shader model 2.0

You can change that in the options.ini (fullscreen = 1) or in the options ingame (graphic tab)

What graphic card do you have ?

I believe it is a 'sis 661FX/GX Mirage' I think. I may be looking at the wrong thing. I would like to say that I have heard about the fullscreen=1 thing but have never been able to find the options.ini file. I've heard it's meant to be on the first page and I do have a load of files displayed but none with such a title...

And I can't even run the game so any ingame options will just not work... Which I'm just guessing is what you meant by the second option.

The file might just be called options if you don't display known endings.

It's in documents\electronicarts\thesims3

I believe I have tried that too. It may be worth mentioning that the game is originally Russion (or Latvian, but I think I was right the first time), that may have a difference on what files are saved where...

But you do have a documens\electronicarts\thesims 3 folder ?

Yes but no options

Try renaming the folder and let the game create a fresh one by starting the launcher without the folder

All your savegames and downloads will be gone from the game but they are still in the renamed folder so don't worry.

Now check if you have the file. If you do, you can move it to your desktop, delete the new folder and rename the old one back to thesims3.com. Now move the options file to that folder.

Again nothing I've decided to go ahead and install and reinstall everything. Maybe it'll appear then although it wil take a while -_- I'll post again once it's installed to speak of my results.

Nope still no options, still won't let me play it. No difference ☹️

Could you post a screenshot of your thesims3 folder in documents please

Upload to some photo sharing site and add the link to your post.