When I open the game in Windows 10, the game opens in a reduce screen of 5x7 instead of full screen, is there anyway to adjust this?

this happens when the game | system doesn't detect a gpu

Windows 8, 8.1 & 10 1st step is to enable dirrectplay
https://windowsforum.com/threads/turn-on-direct-play-to-use-older-games-windows-8-8-1-1-and-10.205952/

if you have an Nvidea gpu then it doesn't support 32bit systems anymore so you need 64bit os to run games with Nvidia cards

if there is a V-host i.e, Hyper-V, Vbox etc then you need to give gpu