In reply to nikoid:
Nothing wrong with PC World. If you like you can walk out having got the sales advice and look online.
Decision points:
Budget: I'd suggest 350-600. Pay more, get more speed and space etc, better streaming ability if you need that.
Processor and graphics: pretty much anything will be ok. Don't worry too much about these.
Look at size of your photo library and other files - multiply by 3 and round up to nearest disk size. If possible as suggested above, get an SSD as that makes a *major* difference.
Physical size of screen - do you want more portable or more usable.
Screen resolution: 1920 x 1080 should be fine - think about whether an external monitor would be useful.
I mostly get Dells for work, and have bought HPs for friends. Be very gentle with the hinge on the screen.