Windows Vista Renaming of Pictures' Files

[winplus]

I have problem in renaming my pictures' file names in the folder with my Windows Vista Home Premium PC. e.g. I have 100 photos in a folder and I want to rename all files using "Summer Vacation 2007". After renaming, the first photo becomes "Summer Vacation 2007 (2)" instead of "Summer Vacation 2007 (1) and the last photo becomes "Summer Vacation 2007 (1)" instead of "Summer Vacation 2007 (100). Before I do the renaming, I sort all photos in the folder by "Date Taken" and select "Ascending". I don't have this problem with Windows XP before. Can anyone help? Thanks.