Mac Problems...

For the first time since i bought my mac i have found a major flaw. i only have 64 MB of Video RAM. what the hell is that. that isn't even enough to run basic video games. so i didn't know this of coarse until i download and install the Spore Creature Creator, the game i have been waiting 4 years for, and find out my mac isn't ad good as it should be. what i don't understand is if my computer cannot handle a program why does it let me install it still. grrrrr.