insufficient access privileges to rename items

[ARENY]

I just recently bought a new macbook, and I transferred all of my files from Windows XP onto the new computer. Whenever I try to change the names of files that I transferred, it says that I have insufficient access privileges. I can rename files that I created on this Mac, but not the old files. I did the disk repair, and it didn't work. I also make sure that I had privileges for that particular folder. This is my first mac, so I don't really know what I am doing, but I did do the things that would usually be done to repair privileges. Can anyone help?

 

[JKitterman]

See Setting Permissions in Finder Help on your computer