I always wondered where my Office PC got it's facility to resize Pics and lots of them at once too.
Just by selecting as many JPEGS as you want, right click then choose RESIZE,
and it gives you 4 size choices.
The 800 X 600 is ideal for forum and WEB posting
So I wanted to duplicate this facility onto my Laptop.........
Took me ages to figure it out, but it's called
POWERTOYS for Windows, a free Download through Microsoft.
Works a treat far quicker than any other Picture manager software as its an ADD ON to the windows system.