How do you stop Window 7 from Freezing

I was playing Mapple Story on my Windows7 earlier and it froze rite on the game -___- this isnt the first time it does that either and idk how to stop that. its really annoying and its losing EVERYTHING I was doing all the time.. D:

There are a lot of things that could cause that. First, the Mapple Story web site doesn't include Windows 7 in the System Requirements (below). If you're running it from an EXE, you can right click on the EXE file in Windows Explorer, select properties/compatability and set it to run under XP. Check the minimums below and make sure your machine meets them.

OS Windows 98ME/2K/XP Windows 98ME/2K/XP
CPU 3-1Ghz P 4-1.8Ghz
RAM 128MB 256MB
HDD 1.5GB 3GB
VGA 3D Acceleration card 3D Acceleration card
SOUND N/A 16bit Sound Card
NETWORK 56kbps Modem