Broke (Diablo 2)

I temporarily use the integrated video card intel hd graphics 2000. I always play in full-screen mode and when I start two game clients I cannot switch between them normally. I used to switch with the alt + tab combination, but now a black screen appears and I have to return to the desktop with the win key to open the second diablo from the taskbar. Is there a way to fix this, or do noobs have to suffer?