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I have Picasa but it doesn't resize. Unless I have'nt figured it out yet. The other one on my last computer was from Microsft site called powertoy or something like that. I need to do this stuff without liquid intelligence so my memory works
It's the picture resizer power tool (if you're talking about just right-clicking on the picture in a folder and clicking "resize picture").
go to microsoft.com, search for "power tools" and it'll be in the list.