windows xp with in windows 7 gaming?

try running in xp compatibility mode first (open the properties of the shortcut, go to compatibility, etc.)

no it wont work ,starcraft color is messed up and homeworld wont even start

Windows XP Compatibility Mode for Windows 7 isn't all that great - it lacks graphic acceleration, and it seems to emulate a RDP connectio to a virtual machine - not the best way of implementing it.

If you can get your hands on VWMare Workstation 7.0, you could probably run those games, I think, because VMWare Workstation 7.0 includes DirectX 9.0c acceleration within virtual machines.

Alternative Option (1) Dual boot with Windows XP or (2) keep an older desktop / laptop around that can play XP games decently.

I do both - I've got a desktop and laptop, each with Windows 7 & Windows XP installed.

Windows XP mode in Win7 is for legacy "productivity" applications, not games. It's only of use for VM testing and running legacy corporate apps.

There is XP Mode for Professional and Ultimate editions of Windows 7, but it lacks GPU acceleration, so its not for gaming, you could try the normal compatibility mode for XP or Vista (depending on the game) to get it to work, Directx9 Mode instead of Directx10, Open GL mode if the game supports it (as a last resort) Starcraft, and Homeworld would be best run in Open GL Mode

its also good to have a Creative sound card (i see that you do), and have Open AL API installed, Along with Creative Alchemy to convert Directx sound into Open AL

Alchemy program has fixed allot of compatibility issues with games that didn't work without it on Vista/7 (due to Directx sound API being removed)