I can no longer edit ANYTHING on my External HDD

[supergabs14]

As the thread title says I can no longer edit anything on my External HDD (change name, delete, rename etc.).

First I used this HDD for my movies only.
After a few days I got the idea to use it as a TimeMachine backup as well at the same time. At first it worked great but slowly(it started with just a few) I could no longer edit my movies. I deactivated TimeMachine and wanted to delete the backup.backupdb but every time I try to delete something in the HDD it gives error 'Right: com.apple.desktopservices'

I have tried changing the permissions: Read and write
I have tried Repair Disc Permissions in Disc Utilities but the option is grayed out.

Is there anyway to get the permissions back? I COULD reformat the entire drive but I really want to keep my movies (150 GB worth).

INFO:
Mac OS 10.6.2
Movies are located on an external HDD connected through USB.
The EHDD is formatted Mac OS Extended (Journaled) and is 1TB in size.

 

[Bennieboy©]

move your movies to your main HD then format?

 

[supergabs14]

@ Bennieboy©
My HDD is big enough to hold all my movies.
The thought has crossed my mind but the problem is if I move a movie to my HDD I STILL cannot edit it. It still belongs to desktopservices or whatever.

 

[Bennieboy©]

just a query, but if your movies have all got names, then why would you want to edit them?

hmm, can you edit the permissions via right clicking the drive?

 

[supergabs14]

I use unwatched/favourite/watched labels for my movies.
Also sometimes I want to delete some files or change the description.

Changing the permissions has no effect on wether or not I can edit it :/
I did it for the Entire HD and all it's contents but as you can see the options are still grayed out.