Why wont my games stretch across the three monitirs

Right click on your desktop / resolution and select "extended desktop".

During the game? The desktop is extended and browsing is extended, but when I play games it automatically duplicates instead of extending....

Does your video card support surround displays? A bit more information like system specs and the monitor specs would be helpful.

if it's an ATI card, you have to go to the CC control panel and enable "eyefinity". In Nvidia, I think it's called "surround". Without these enabled, standard stretching your display won't do anything for games. Those options have to be enabled.

Monitors- 2 dell -23 inch, model s2340m each have dvi/VGA connection available and
Acer model h233h 23in LCD same connectors as above plus 1-hdmi

Graphics card - h.i.s. hd7870 ghz
Running win7
Processor: amd fx 6100 3.3ghz

Eye finite group is set up but still not working....

*eyefintiy.

Can you set the resolution to 5760x1080 in the game? Also make sure the games(s) support this resolution.

For Eyefinity most all AMD cards require that at least one of the monitors is connect with a DisplayPort or active DisplayPort adapter. Plus not all games support Eyefinity so even if you have it enabled if the game does not support it you will not get gaming across all three. With out knowing what games you are trying to use can't say for sure.