Team Leader answers:

Deamon tools is used for make a virtual cd and dvd.
If any game require cd to play it.Then use deamon tools and make a virtual cd.If your gta san andreas require cd or dvd then use Deamon tools.Download deamon tools from

http://www.daemon-tools.cc/downloads

After download,when you start installation it require restart to make new virtual cd dvd drive.After restart install deamon tools.After that you see deamon tools icon on the takbar.Click on it and put your gta san andreas(which is paced in rar,iso,zip etc) in it.Then you can play it without any cd or dvd requirement.