Trying to move files: Access Denied!

Ok I made a mistake. Before I bought Vista I had setup a partition for 10GB for a windows os (I was using Win 2000 before Vista). So I'm redoing my system and I want to install SQL Server 2005 on to a different drive. In order for me to do that it still has to copy 1.6 GB of temp files to my C: drive! So I'm trying to move some files off of my C Drive on to my data drive temporarily.

My Problem / Question is this: I cannot delete some files from my C Drive (usually dlls or exes) They can be copied somewhere else but not deleted even though I am an Administrator on this machine. I have tried "Taking Ownership" of these files and then moving them but it still doesn't work! How can I delete these files without getting the error: "You need permission to perform this action"?