Always crashing/ or huge lag

Hi, i'm a total noob with computers and im absolutely clueless of what's going on...

my pc keeps lagging or crashing when i play games

my specs:
Acer Aspire AX3300
OS: Windows 7 Home Premium 64-bit
CPU: AMD Athlon II X2 240 dual core processor
Memory: 3 GB DDR3
HDD: 320GB
ODD: DVD Supermulti drive
VGA: NVIDIA 9200 Integrated Geforce

Now, from what i've heard this aint really a 'gaming-computer' but i play games like GTA San Andreas on lowest graphics and it gives me a huge lag after like 2 minutes of playing, and the other game i play is Age Of Empires Rise Of Rome and it makes my computer crash after a couple of minutes.. very frustrating. BTW they're both original, NOT downloaded.

What could be causing this?

Cheers, Fred

 

I think that's your answer. You might be asking a bit much for such underpowered graphics.

 

Your using an integrated card. As Prunejuice has stated, its definitely not the most powerful card out there. If you are to purchase a new card, however, I would wait untill the end of this month, as Black Friday tends to carry some pretty intense savings all around.