For starters have you looked at the ones included with the OS? FreeCell, Hearts, Minesweeper, Purble Place, Solitaire, and Spider Solitaire all come with Windows 7.
I want to download some games I can play offline that wont slow down my computer. But they must be compatible with my ASUS netbook with windows 7. I have 1 gig of ram. The games have to be free. Thanks!