Hello and welcome to the forums
You provided very little information... The help you get depends only on the quality of information YOU provide.
I'm not sure what you mean by "new version of this game system" If you mean is there newer laptops available, yes there are, yours is about 4-5 years old which is typically pretty old for laptops, especially if you're using it for gaming.
Regarding not being able to run games, well, YOU need to tell us which games you're trying to run and with what settings. I'll tell you right now your laptop won't be able to run black ops or crysis.
Regarding the playing games first time and then not being able to play them again. Not sure, could be a number of issues. The first one being virus/malware...