I´ve tested 6 games with my new computer. Only Blood 2 runs correctly, incredible.

Dell XPS17,
Processor: Intel® Core™ i7-2720QM S.G 2,20 GHz cWith Turbo Boost 2.0 up to 3,30 GHz
Graphics: NVIDIA ® GeForce ® GT 555m 3GB
RAM: DDR3 SDRAM 6.144 MB 1.333 MHz Dual Channel [1x2.048 + 1x4.096]
O.S: Win 7 64 bits (and Ubuntu 11.04, not used for gaming)
HD: 500GB (7,200rpm) Serial ATA Hard Drive

Age of Wonders: Sound, but no image.
Blood : Can´t run Dos Box fixed with Xp compatiblity mode
Last Express: Sound but no image. If I exit the game using the windows metakey, and then enter again I can play... On a tiny window.
Alone in the Dark (original one): Same problem that the one seen above.
Duke Nukem: Complete disaster, the game not only crashed, it changed most of my system configuration. I was forced to reinstall all the OS using the laptop hidden partition.
I didn´t test more to not get depressed, but there seems to be a huge incompatibility with DosBox, and even considering that Age of Wonders is not Dos Box based...

I´m really happy with my new laptop computer, I´ve finished many games with it (Dead Space, Dragon Age, Need for Speed Hot Pursuit, Mirror´s Edge, Crysis, Fable 3) and everyone of them run fine and with hight details, but it´s really sad to have this kind of problems with my GOG´s. At least i have my old desk computer for them, I was planning to buy a new one but now... probably not.

Some ideas:

For the sound, but no image problem, I wonder if this is related to resolution. These older games are likely trying to run at different resolutions than your display. Googling suggests that your display is 1600x900, is that right? Any game that tries to run with more vertical pixels than that will cause problems... for example, 1280x1024 won't work. Make sure that's not the case.

Even if they're trying to run at LOWER resolutions, sometimes systems have trouble changing the resolution. Make sure your machine can actually switch to the resolution the game is trying to use, or alternatively play your games in a window.

To use a window with DOSBox games, it's quite easy. In each game's install directory there will be a .conf file, usually it's named after the game. Edit that file with notepad, and look for a line that says "fullscreen=true". Change it to "fullscreen=false". Now the game will launch in a window. Then, find the line that says "windowresolution=original". Change that to whatever resolution you want, for example, "windowresolution=1024x768". That will make the window bigger; no more tiny window like you saw with Last Express.

For Duke Nukem 3D, did you just try running the game directly in DOSBox? An alternative is to use eDuke32, a source port that runs the game natively in Windows. It's easy to use and will probably work better, and it (optionally) adds modern features like enchanced graphics, high resolutions and better mouselook. You can find instructions for using it elsewhere on these forums. I ran the game with original graphics but used mouselook and my native resolution under eDuke32. It worked great.

That should solve all your DOSBox game problems, as for Age of Wonders, you might need some tweaks... check the GOG forums for how to change resolution in that (or how to run windowed). I don't have that game so I don't know personally.

There's also a possibility that updated graphics drivers would help in running these older games fullscreen, but windowed mode is likely easier.


EDIT:

Forgot to mention, another possible solution for the Duke Nukem problem is to use a different video mode... the GOG version comes with a little program that changes the output mode, usually it's set to Surface by default but many users need to change it to OpenGL to get the game to run. eDuke32 might be a safer bet though, especially since the game gave you so much trouble before.

Whaaat. It's friggin impossible to DOSBox change crap in one's system. But it looks like your graphics card didn't like the 320x240 resolution of the game. I'd reccomend downloading EDuke32, it runs DN3D like a charm on all Windozes.

About the rest of DOS games... definitely you must change the graphic output settings. Each DOS GOG game has funky little program called in menu "Graphic mode setup", it's essential sometimes to change the output method (opengl or direct3d).