That spec is more than enough for what you want from the laptop, but the model code you have there isnt a Toshiba model code, sounds like something PC World have as a item code instead. Most Toshiba laptops will have a model code beginning with C or L and then 3 numbers, like mine below.
4GB of RAM means a lot of available memory for the laptop to operate with, to open and run applications and programmes. It means it can run large programmes in the background without slowing down other programmes or applictaions you are using. It will be more than enough for what you need.
640GB Hard Drive is the amount of space available for said programmes, applications and everything else like photos, videos, films, music and so on.
Without knowing exactly what model laptop it is, I couldnt advise if the processor is good or great.
I have a Toshiba myself, a C650 with 4GB RAM, 250GB memory and a dual core processor. I am not into gaming so the spec is exactly what I want and need. I also have two 1TB external hard drives that I use for storing photos, music, films and more.
Anyway... I would easily recommend Toshiba, but shop around. I found PowerCity to be the cheapest when I was buying.