The way I understand it, you created a tag for your pictures, but within the tag you created you also have all the pictures, movies, etc. that came preloaded with Vista. If that's the case, you can proceed as follows:
1. Delete the Tag you created (this will move the pictures to the Not Tagged folder)
2. Now select the pictures you want to create the New Tag for using either of these two methods:
a. If selecting multiple/continuous pictures in a row and/or column: Click the first picture on the Row or Column > Press and hold the Shift key > Move the mouse pointer to the last picture > Click any of the highlighted pictures and select Add Tag.
b. If selecting specific pictures from a row or column, while sleeping others you don't want to add to the tag: Press and hold the CTRL key > Click each picture that you want to create a new tag to > Right click one of the hi lighted pictures and select Add tag |