Problems deleting files and folders

I have many files and folders in my pc which i am no longer using it. I want to delete these but a error message appears "Cannot delete (file name): access denied Make sure the disk is not full or write protected and that the file is not currently in use." I have tried many things but unable to delete these files and folders. I dont have the administrator password too. please help.
:no:

You should have mentioned your Operating System as well to assist you better. But anyway, if i consider it as Windows Xp than there is a simple to delete such files. You can simply follow the steps mentioned in the following post: http://forums.techarena.in/tips-tweaks/1129447.htm.

But make sure you have to be Administrator or you may need to enter admin password if prompted. :thumbup1:

Thanks mate. i will try it. thanks a lot.:notworthy