Hi guys. Was just wondering if anyone knows of a way to make the game properly fullscreen. I hit Alt Enter and all i get is the same game size with the rest of my laptop screen being blacked out. Is this just me or is it normal? The game itself has no problems but i think i would enjoy the game more if i could just get it to full screen!!!!
Any comments would be much appreciated!!

This didn't happen for me, but my best guess is to check out the settings in the .conf file for the game, which you should find in the game directory (it will probably be called something like stonekeep.conf). There is a setting for screen resolution in there, where you should be able to manually set it to something that approximates your screen resolution. If you're not sure what to test, go ahead and paste the contents of the .conf file in this forum and people should be able to help you out.
A less likely situation is that you do not have scaling enabled in your graphics drivers... check your display settings for your graphics card and see if there's an option to "enable GPU scaling" or something like that (you should enable it). Thing is, if that were the problem you'd probably see this same issue in EVERY game you play, not just Stonekeep, unless all the other games manually set the resolution, which is possible.
Hope that helps!

Thanks for the reply. I checked the game directory and all i can see is a dosbox.conf file :S. I have however got access to a 'graphic mode set up application'. Will this do the same job?
Ah. i've just read online that, 'apparently', vista no longer supports fullscreen dos games :S. any ideas on how to get past this, if it's true?
my laptop is a sony vaio vgn-nr32m/s supporting vista home premium by the way.

You don't have to worry about the Vista thing... that's referring to native DOS support under Vista, but you're running DOSBox, which is a DOS emulator. DOSBox definitely works under Vista and should allow fullscreen.
That dosbox.conf file is probably what you want. Sometimes individual games can have their own tailored .conf files, and I thought that this might have beeen the case for the GOG version of Stonekeep (I don't remember and actually don't have it installed anymore). If Stonekeep is the only game you are running under DOSBox, though, go ahead and just change the general dosbox.conf file to get it to work. Check the resolution options in the .conf file. You can also set it to default to fullscreen if you like. Look for the "fullresolution" option... my guess is that this is set to "original" meaning that it's trying to reset your laptop's resolution to match the game's original resolution. But if that's not a resolution that is supported by your laptop, it might lead to it running in a tiny box like it is for you. So instead you can manually set a resolution here. For details on editing .conf files, check out the DOSBox wiki:
http://www.dosbox.com/wiki/Dosbox.conf
Again, if you can't get the options to work out, go ahead and paste the contents of the file here and we can take a look at them.
EDIT:
Also try running the graphics mode setup application (this is provided by GOG). It's basically a front-end to change some of the graphics settings in the .conf file. If it's set to "surface", try changing it to something else, because I've heard that "surface" does not allow hardware scaling which means your computer cannot stretch the image to fill your screen (and must instead reset the screen to the resolution of the game, which as I said above might not be possible on your computer depending on your graphics hardware).