Linking computers to increase performance [duplicate]

I have 2 laptops (one of which is my primary PC) and a desktop PC. The desktop run on Vista Home Edition, the secondary laptop also runs on vista and the primary laptop runs on windows 8.

It is possible to link these machines in order to increase the processing power and speed of my primary laptop?

No. what you are describing is called High Performance Clustering, and it requires specialized hardware and software that is capable of distributing the load over multiple processing units.

Here is one type of supercomputer that can be built with a HPC composed of normal computers, customized for the task. it still needs a specialized OS and applications however.