My System is
Intel Celeron 1.7 GH,256 Ram,64Mb Built-in VGA Card
If u guys say that my system is Low,then I would like to say I have been playing these games since 2 weaks ago but thay works 100% correct.
But anyways after starting this topic(just 10 mins).Avast catch a virus named "Win32:Trojan-gen {other}"
I think this virus was the main problem and then I do everything what Avast can, but it could not do anything,and then I have deleted this file from c:/windows.