My game keeps crashing on Vista

[hansenawesome15 9]

 Hello,

I'm using SimCity 4 Rush Hour on Window's Vista.  While I play, it will just, out of the blue, crash.  The game will stop, and my game disappears and then it takes me to the desk top.  I've noticed that if I restart my computer, (I keep it in sleep or standby most of the time) the crashing goes away.  But after playing for a little while, it comes back.  The crashes will happen at any random moment in the game.  It happens out of nowhere.   I've noticed that the crashes happen more and more often until I restart my computer.  Other than that, the game runs great.  Has this happened to anyone else?  Does anyone know how to solve the problem?