Nasmw/cmd.exe error in VC6

I've been all over the forums for days trying to fix this but none of the fixes work for me, here is the error I get when I try to build using VC6 on Windows XP:

Performing Custom Build Step on ..\engine\terrain\blender_asm.asm
Access is denied.
Error executing c:\windows\system32\cmd.exe.

torqueDemo_DEBUG.exe - 1 error(s), 0 warning(s)

when i try to run nasmw.exe through the command prompt it tells me "Access is denied."