Possibly the abacus, a board with wood rods, and wood beads on the rods. It is thousands of years old.The first electronic computer, I think, was Univac. It used vacuum tubes instead of solid state...
Technically, any computer that meets the minimum requirements is "Vista-capable". In reality, you may find the listed requirements too conservative to run Vista at an acceptable level. Intel Pentium...
If your computer has a modem connected to it via a Network Interface Card. Which is connection to your land line, providing you have a plan with an Internet Service Provider then yes you should be...