Adobe Premiere CS3 freezes often

I don't know if somebody understands what is happening? It is getting annoying...

I have a Dell Intel Core2 Quad CPU Q9300@2.50GHtz 2.68 GHtz 4.00 GB ram, and 32 bits operating system with windows vista home Premium.

When I work in the timeline it freezes and I can't see anymore motion in the reference monitor. I have to close the program completely and reopen everything so that I can continue on working. It's happening more and more often and it is a big waste of time.

Please help me understand...

Thank you
 
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