There are my people on internet who say that they cant open QB4.5 because of this error:

And I found a solution! You get this error when you have a shortcut of QB4.5 made by right click on QB4.5.exe, shortcut is created by itself.
If you delete that shortcut everything will work.
But I don't know why but when you create shortcut by clicking create shortcut everything works fine.
If you don't believe me try it!
(first try then comment)