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Yes, Calli's guess was right - your processor, RAM, and graphics chip are all far too weak to be playing TS3; especially on Vista. It also looks like this is a laptop, in which case it could also be overheating.
To be honest, given how underpowered that system is, I doubt you're going to be able to do much about it - nevertheless, you can try the tips here; although bear in mind that even if they work, it will be temporary and your computer probably won't last long if you keep trying to play TS3:
Game Help:Onboard Graphicswiki.
To play TS3, your computer would need to meet or exceed these requirements:
Game Help:TS3 System Requirementswiki.
What I lack in decorum, I make up for with an absence of tact.