Have you tried Help/Updates in Photoshop?
More info. Using Windows 7.
Also, when I go to Help/About Plug Ins/Camera RAW, I find that I am supposed to have version 6.0 of the plug in, but there seems to be no way to update that plug in.
So, I went to the website and searched FOR AGES until I found the download page for the updates. First I tried to update to 8.5. No go. So I searched until I found the first version that supported the D7000 .NEF files (6.3). Tried to download that. Got the error message telling me to download and reinstall the download manager. Did so. Tried to download and install 6.3 again. Same error.
Oh, and when I try to do a general "Update" of PS CS5, I get a message that I am up to date.