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Restarting and reinstalling is all that I am doing for two days, but nothing changes.

I didn't suggest you reinstall. What monitor config were you referring to that you changed from 1 monitor to 2?

loukingjr wrote:I didn't suggest you reinstall. What monitor config were you referring to that you changed from 1 monitor to 2?

English is not my native language so it's hard for me to understand what do you want to ask me in your last post. Can you explain it in other words?

What did you mean by this?

I had virtual screen then i used to monitors configuration but now i use one monitor configuration…

loukingjr wrote:What did you mean by this?

I had virtual screen then i used to monitors configuration but now i use one monitor configuration…

Ok. You suggested me to choose resolution in virtual screen section in menu. I remember that I had this section some times ago, probably then I chose two monitors in configuration menu. But now I use one monitor and now I don't have virtual screen section in menu. I tried to chose two monitors in configuration, but I can't see virtual screen section in menu. Something have changed in my virtualbox, but I don't know what it is. Please help me to solve this problem.

I have a little progress on the way to solve my problem. After electricity shut down, i boot my mac and start virtual box with win7. Now resolution is smaller then it was previously, but i can see virtual screen 1 menu. Suddenly i can't choose any resolution in it. Please help to return my 1920x1200 resolution

The guest additions have to be installed in a guest before you can select one of the resolutions in the Virtual Screen 1 list.