Recently Norton Internet security deleted ml.exe (an assembler I use to program in masm32) off of my computer, thinking that one of the programs I had written with it was a virus (it was most certainly not). Fortunately, I had a copy of ml.exe backed up in an external hard drive, and tried to copy it over to my computer. The old ml.exe was located in C:\masm32\bin, so I tried to copy the new one to that location.

After disabling Norton (which had opened the folder and preventing me from accessing it), I am still unable to copy the new file to C:\masm32\bin. When I tried, Windows announced that I would need Administrator permission to copy the file. Since I'm an admin, I figured this wouldn't be a problem although it was unexpected, as I have never had to provide administrator permission to access this folder before.

However, instead of prompting me to enter my password, Windows simply refuses to copy the file:

I repeat, I was not asked to provide a password. It simply says that I do not have permission.

Does anyone know what's happening and how to fix it? Is Norton still causing problems, or it something else?