Your English is better than the English found in some of Microsoft's manuals and help screens!
Yes, you can play games with this laptop. Here is an extract:
" ... Gaming Performance
The GeForce GT 525M again has to face up to the Radeon HD 6650M (Packard Bell EasyNote LS11) and the GeForce GT 540M (Dell XPS 15 & Schenker XMG A501) in the gaming benchmarks. To keep the processor's impact as low as possible, we have opted for our ultra settings (1920x1080, maximum details) for the comparison – with exception of Metro 2033.
Call of Duty: Black Ops
The newest sequel of the extremely successful Call of Duty series doesn't force the Inspiron 17R to its knees. Very high details, quadruple antialiasing and octuple anisotropic filtering result in an average of 26.4 fps. The GeForce GT 525M places itself almost exactly between the Radeon HD 6650M (24.5 fps) and the GeForce GT 540M (29.1 fps) with this result. Nevertheless, high details, 2x AA, 4x AF and 1600x900 pixels are recommendable for a pleasurable game play.
Call of Duty: Black Ops
Resolution Settings Value
1920x1080 extra, 4xAA, 8xAF 26.4 fps
1360x768 high, 2xAA, 4xAF 44.9 fps
1024x768 medium, 0xAA, 0xAF 56.4 fps
800x600 low (all off), 0xAA, 0xAF 77.7 fps ..."
For the full review read this:
http://www.notebookcheck.net/Review-Dell-Inspiron-17R-N7110-Notebook.52324.0.html
I do suggest an external keyboard and gaming mouse such as Logitech MX-518 or similar. And make sure that the AC Adapter is plugged in for gaming.