Microsoft Photo Info
"Microsoft Photo Info allows photographers to add, change and delete common "metadata" properties for digital photographs from inside Windows Explorer.
When installed, a new "Photo Info" item appears on the context menu for files selected in Windows Explorer. To use, simply select one or more image fiiles, right-click and choose "Photo Info" to open the Photo Info properties editor. You can edit metadata for files individually, or all together as a batch. Photo Info reads and writes metadata in IPTC and XMP formats (depending on file type)."