Can a program write to the root directory of a disk when UAC is turned on without having admin privileges?

Question

If I am not an Administrator and start a program which writes to C:\\ some textfile - will I need admin rights...in Windows 7 or Vista? I see in XP there are no problems to writ

Answer 1

No, you can't write to the root of disk even in Windows XP if you are not an administrator. It's just everyone works as administrator in XP; and this assumption is actually wrong.