Windows 7 resolution problelms IE size of screen

I just bought a new computer and it has windows 7 operating system. it is also loaded with ATI mobility radeon HD 4530 series {default LCD} grapics card. I play in a game site called Pogo and I am having trouble rezising my game to where it is a good size to play. Right now it is about 5x4 inches and I have a 17 inch laptop so this size screen just isnt big enough. I have tried changing the resolution of the computer and it does make the actual screen bigger, but it places the game in the top left of the screen and it is still the small size. the rest of the window is just blank. I had another computer and it was vista operating system and it let me change the size of that screen and actually let me "stretch" the screen to a bigger size. I have talk to HP as it is thier product and got a very nice gentlemen to help me, but in the end he could not solve the problem.I am sure I am not the only person in the world with windows 7 operating system that is having this problem and would like to know if anyone else is having the same problem and if there are any "fixes" for it.