Why is that technology improves over time?

I know this might sound like a stupid question but i’ve always wondered why we have more technology now than they did in the past like the 1800’s and how people in the 1800’s have more technology than people in the 1600’s. And people in the year 2050 or 3000 would have more technology than us.

Why is it like that. When I was younger I use to just think that humans just get smarter over time but now I know it’s not the case.

How do i find out my current systems settings?

I am running windows Vista, i need to know the specifications to my Pc because i am considering buying a better graphics hard and i need to know if my processor will cope with it.

I baught it as a complete package and technology has really moved on the last couple of years, and help wil be appreciated.