I don't have the scope you have but as a general rule you don't need a powerful computer. Things that are useful however and that are becoming rare on new computers are dedicated serial and parallel ports. Many of the older scopes use serial connections and parallel ports are used on modified webcams and older CCD cameras. Also using the notebook outside in the cold and dew is'nt great for expensive new laptops. I have had the hinges freeze up on my first expensive laptop and eventially the hinge broke off.
You can use usb to serial converters etc but these seem to be problematic sometime. I got my laptop from
these people with win2000 and a parallel port (that I needed for my CCD).
I'm sure there are other choices also.