So I'm upgrading to Windows XP from Windows 2000, but the install can only get as far as copying the installation files before it gives me an error message saying it can't write to C and that I should turn off my antivirus program and try again. However, even when I disable Norton (Symantic Anti-Virus Corporate Edition, actually), and end as many programs as task manager will let me, I still get the error. I'd really prefer not to have to reformat, otherwise I'd simply do that. Thoughts/Solutions?