I have yet to find any PC that didn't hang up. As such I can write that a no hang PC has yet to be made.

As to the 3GB RAM, that's a sign this is a value machine. The 5470 GPU is at the low end and should be an OK solution unless you have a GAMER in the house. As to 512MB video graphics the GAME will tell you if that's enough.

Your comment about Windows 7 takes up a lot of memory is a strange one. I found it takes less than Vista!